31664563 has 16 divisors (see below), whose sum is σ = 37428480. Its totient is φ = 26221536.

The previous prime is 31664561. The next prime is 31664573. The reversal of 31664563 is 36546613.

It is a cyclic number.

It is not a de Polignac number, because 31664563 - 2¹ = 31664561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31664561) 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, 46020 + ... + 46702.

It is an arithmetic number, because the mean of its divisors is an integer number (2339280).

Almost surely, 2^31664563 is an apocalyptic number.

31664563 is a deficient number, since it is larger than the sum of its proper divisors (5763917).

31664563 is a wasteful number, since it uses less digits than its factorization.

31664563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906.

The product of its digits is 38880, while the sum is 34.

The square root of 31664563 is about 5627.1274199186. The cubic root of 31664563 is about 316.3669927044.

The spelling of 31664563 in words is "thirty-one million, six hundred sixty-four thousand, five hundred sixty-three".