31491963 has 16 divisors (see below), whose sum is σ = 46757760. Its totient is φ = 20948328.

The previous prime is 31491959. The next prime is 31491983. The reversal of 31491963 is 36919413.

It is not a de Polignac number, because 31491963 - 2² = 31491959 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31491913) 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, 14856 + ... + 16842.

It is an arithmetic number, because the mean of its divisors is an integer number (2922360).

Almost surely, 2^31491963 is an apocalyptic number.

31491963 is a deficient number, since it is larger than the sum of its proper divisors (15265797).

31491963 is a wasteful number, since it uses less digits than its factorization.

31491963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2583 (or 2577 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 31491963 is about 5611.7700416179. The cubic root of 31491963 is about 315.7911180309.

The spelling of 31491963 in words is "thirty-one million, four hundred ninety-one thousand, nine hundred sixty-three".