31813963 has 4 divisors (see below), whose sum is σ = 32142040. Its totient is φ = 31485888.

The previous prime is 31813949. The next prime is 31813973. The reversal of 31813963 is 36931813.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31813963 - 2²¹ = 29716811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31813913) 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, 163893 + ... + 164086.

It is an arithmetic number, because the mean of its divisors is an integer number (8035510).

Almost surely, 2^31813963 is an apocalyptic number.

31813963 is a deficient number, since it is larger than the sum of its proper divisors (328077).

31813963 is an equidigital number, since it uses as much as digits as its factorization.

31813963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328076.

The product of its digits is 11664, while the sum is 34.

The square root of 31813963 is about 5640.3867775180. The cubic root of 31813963 is about 316.8637739929.

The spelling of 31813963 in words is "thirty-one million, eight hundred thirteen thousand, nine hundred sixty-three".