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13031111 = 139241389
BaseRepresentation
bin110001101101…
…011011000111
3220112001022202
4301231123013
511313443421
61143145115
7215522402
oct61553307
926461282
1013031111
1173a0515
12444519b
132913422
141a32d39
15122610b
hexc6d6c7

13031111 has 8 divisors (see below), whose sum is σ = 13213200. Its totient is φ = 12850560.

The previous prime is 13031101. The next prime is 13031159. The reversal of 13031111 is 11113031.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-13031111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13031092 and 13031101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13031101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33305 + ... + 33693.

It is an arithmetic number, because the mean of its divisors is an integer number (1651650).

Almost surely, 213031111 is an apocalyptic number.

13031111 is a deficient number, since it is larger than the sum of its proper divisors (182089).

13031111 is a wasteful number, since it uses less digits than its factorization.

13031111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769.

The product of its (nonzero) digits is 9, while the sum is 11.

The square root of 13031111 is about 3609.8630167916. The cubic root of 13031111 is about 235.3208895310.

Adding to 13031111 its reverse (11113031), we get a palindrome (24144142).

It can be divided in two parts, 13031 and 111, that multiplied together give a palindrome (1446441).

The spelling of 13031111 in words is "thirteen million, thirty-one thousand, one hundred eleven".

Divisors: 1 139 241 389 33499 54071 93749 13031111