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31001113 = 1113216791
BaseRepresentation
bin111011001000…
…0101000011001
32011100000112101
41312100220121
530414013423
63024243401
7524335153
oct166205031
964300471
1031001113
1116554660
12a470561
136565870
14418dad3
152ac57ad
hex1d90a19

31001113 has 8 divisors (see below), whose sum is σ = 36421056. Its totient is φ = 26014800.

The previous prime is 31001111. The next prime is 31001119. The reversal of 31001113 is 31110013.

Adding to 31001113 its reverse (31110013), we get a palindrome (62111126).

Subtracting 31001113 from its reverse (31110013), we obtain a square (108900 = 3302).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31001113 - 21 = 31001111 is a prime.

It is a super-2 number, since 2×310011132 = 1922138014477538, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31001113.

It is not an unprimeable number, because it can be changed into a prime (31001111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108253 + ... + 108538.

It is an arithmetic number, because the mean of its divisors is an integer number (4552632).

Almost surely, 231001113 is an apocalyptic number.

It is an amenable number.

31001113 is a deficient number, since it is larger than the sum of its proper divisors (5419943).

31001113 is a wasteful number, since it uses less digits than its factorization.

31001113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216815.

The product of its (nonzero) digits is 9, while the sum is 10.

The square root of 31001113 is about 5567.8643122835. The cubic root of 31001113 is about 314.1418247174.

The spelling of 31001113 in words is "thirty-one million, one thousand, one hundred thirteen".

Divisors: 1 11 13 143 216791 2384701 2818283 31001113