31129307 has 12 divisors (see below), whose sum is σ = 34358688. Its totient is φ = 28182000.

The previous prime is 31129303. The next prime is 31129333. The reversal of 31129307 is 70392113.

It is not a de Polignac number, because 31129307 - 2² = 31129303 is a prime.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31129303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44057 + ... + 44757.

It is an arithmetic number, because the mean of its divisors is an integer number (2863224).

Almost surely, 2^31129307 is an apocalyptic number.

31129307 is a deficient number, since it is larger than the sum of its proper divisors (3229381).

31129307 is a wasteful number, since it uses less digits than its factorization.

31129307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090 (or 1079 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 26.

The square root of 31129307 is about 5579.3643903226. The cubic root of 31129307 is about 314.5742362392.

The spelling of 31129307 in words is "thirty-one million, one hundred twenty-nine thousand, three hundred seven".