31131907 has 8 divisors (see below), whose sum is σ = 31876416. Its totient is φ = 30390912.

The previous prime is 31131887. The next prime is 31131929. The reversal of 31131907 is 70913113.

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 2^k-31131907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31131977) 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, 27313 + ... + 28429.

It is an arithmetic number, because the mean of its divisors is an integer number (3984552).

Almost surely, 2^31131907 is an apocalyptic number.

31131907 is a deficient number, since it is larger than the sum of its proper divisors (744509).

31131907 is a wasteful number, since it uses less digits than its factorization.

31131907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1757.

The product of its (nonzero) digits is 567, while the sum is 25.

The square root of 31131907 is about 5579.5973869088. The cubic root of 31131907 is about 314.5829940126.

The spelling of 31131907 in words is "thirty-one million, one hundred thirty-one thousand, nine hundred seven".