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31332013 = 69145343
BaseRepresentation
bin111011110000…
…1011010101101
32011221211102221
41313201122231
531010111023
63035315341
7530213656
oct167413255
964854387
1031332013
1116760229
12a5abb51
13665036b
14423852d
152b3d85d
hex1de16ad

31332013 has 4 divisors (see below), whose sum is σ = 31378048. Its totient is φ = 31285980.

The previous prime is 31332011. The next prime is 31332029. The reversal of 31332013 is 31023313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31023313 = 33719203.

It is a cyclic number.

It is not a de Polignac number, because 31332013 - 21 = 31332011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31332011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21981 + ... + 23362.

It is an arithmetic number, because the mean of its divisors is an integer number (7844512).

Almost surely, 231332013 is an apocalyptic number.

It is an amenable number.

31332013 is a deficient number, since it is larger than the sum of its proper divisors (46035).

31332013 is an equidigital number, since it uses as much as digits as its factorization.

31332013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46034.

The product of its (nonzero) digits is 162, while the sum is 16.

The square root of 31332013 is about 5597.5006029477. The cubic root of 31332013 is about 315.2555681886.

Adding to 31332013 its reverse (31023313), we get a palindrome (62355326).

The spelling of 31332013 in words is "thirty-one million, three hundred thirty-two thousand, thirteen".

Divisors: 1 691 45343 31332013