31312897 has 8 divisors (see below), whose sum is σ = 39039552. Its totient is φ = 24399600.

The previous prime is 31312891. The next prime is 31312903. The reversal of 31312897 is 79821313.

It is an interprime number because it is at equal distance from previous prime (31312891) and next prime (31312903).

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 31312897 - 2⁷ = 31312769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31312891) 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, 203254 + ... + 203407.

It is an arithmetic number, because the mean of its divisors is an integer number (4879944).

Almost surely, 2^31312897 is an apocalyptic number.

It is an amenable number.

31312897 is a deficient number, since it is larger than the sum of its proper divisors (7726655).

31312897 is a wasteful number, since it uses less digits than its factorization.

31312897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406679.

The product of its digits is 9072, while the sum is 34.

The square root of 31312897 is about 5595.7927945913. The cubic root of 31312897 is about 315.1914415348.

The spelling of 31312897 in words is "thirty-one million, three hundred twelve thousand, eight hundred ninety-seven".