31670681 has 8 divisors (see below), whose sum is σ = 36266304. Its totient is φ = 27092880.

The previous prime is 31670659. The next prime is 31670687. The reversal of 31670681 is 18607613.

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 31670681 - 2¹⁴ = 31654297 is a prime.

It is a super-2 number, since 2×31670681² = 2006064070007522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31670687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 395 + ... + 7968.

It is an arithmetic number, because the mean of its divisors is an integer number (4533288).

Almost surely, 2^31670681 is an apocalyptic number.

It is an amenable number.

31670681 is a deficient number, since it is larger than the sum of its proper divisors (4595623).

31670681 is an equidigital number, since it uses as much as digits as its factorization.

31670681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8911.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 31670681 is about 5627.6710102848. The cubic root of 31670681 is about 316.3873667802.

The spelling of 31670681 in words is "thirty-one million, six hundred seventy thousand, six hundred eighty-one".