31681713 has 16 divisors (see below), whose sum is σ = 49305600. Its totient is φ = 17718096.

The previous prime is 31681703. The next prime is 31681733. The reversal of 31681713 is 31718613.

It is not a de Polignac number, because 31681713 - 2⁸ = 31681457 is a prime.

It is a super-2 number, since 2×31681713² = 2007461877228738, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31681703) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15063 + ... + 17036.

It is an arithmetic number, because the mean of its divisors is an integer number (3081600).

Almost surely, 2^31681713 is an apocalyptic number.

It is an amenable number.

31681713 is a deficient number, since it is larger than the sum of its proper divisors (17623887).

31681713 is a wasteful number, since it uses less digits than its factorization.

31681713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32156.

The product of its digits is 3024, while the sum is 30.

The square root of 31681713 is about 5628.6510817424. The cubic root of 31681713 is about 316.4240987578.

The spelling of 31681713 in words is "thirty-one million, six hundred eighty-one thousand, seven hundred thirteen".