31662681 has 4 divisors (see below), whose sum is σ = 42216912. Its totient is φ = 21108452.

The previous prime is 31662679. The next prime is 31662703. The reversal of 31662681 is 18626613.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31662681 - 2¹ = 31662679 is a prime.

It is a super-2 number, since 2×31662681² = 2005050736215522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31662601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5277111 + ... + 5277116.

It is an arithmetic number, because the mean of its divisors is an integer number (10554228).

Almost surely, 2^31662681 is an apocalyptic number.

It is an amenable number.

31662681 is a deficient number, since it is larger than the sum of its proper divisors (10554231).

31662681 is a wasteful number, since it uses less digits than its factorization.

31662681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10554230.

The product of its digits is 10368, while the sum is 33.

The square root of 31662681 is about 5626.9601917909. The cubic root of 31662681 is about 316.3607247672.

The spelling of 31662681 in words is "thirty-one million, six hundred sixty-two thousand, six hundred eighty-one".