31970681 has 8 divisors (see below), whose sum is σ = 32524800. Its totient is φ = 31421520.

The previous prime is 31970677. The next prime is 31970689. The reversal of 31970681 is 18607913.

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

It is a cyclic number.

It is not a de Polignac number, because 31970681 - 2² = 31970677 is a prime.

It is a super-2 number, since 2×31970681² = 2044248887207522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31970689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13160 + ... + 15398.

It is an arithmetic number, because the mean of its divisors is an integer number (4065600).

Almost surely, 2^31970681 is an apocalyptic number.

It is an amenable number.

31970681 is a deficient number, since it is larger than the sum of its proper divisors (554119).

31970681 is a wasteful number, since it uses less digits than its factorization.

31970681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2479.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 31970681 is about 5654.2621976700. The cubic root of 31970681 is about 317.3832203257.

The spelling of 31970681 in words is "thirty-one million, nine hundred seventy thousand, six hundred eighty-one".