31089897 has 24 divisors (see below), whose sum is σ = 46176000. Its totient is φ = 20150208.

The previous prime is 31089887. The next prime is 31089899. The reversal of 31089897 is 79898013.

It is not a de Polignac number, because 31089897 - 2⁴ = 31089881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31089899) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51604 + ... + 52202.

It is an arithmetic number, because the mean of its divisors is an integer number (1924000).

Almost surely, 2^31089897 is an apocalyptic number.

It is an amenable number.

31089897 is a deficient number, since it is larger than the sum of its proper divisors (15086103).

31089897 is a wasteful number, since it uses less digits than its factorization.

31089897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757 (or 754 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 31089897 is about 5575.8315074973. The cubic root of 31089897 is about 314.4414288490.

The spelling of 31089897 in words is "thirty-one million, eighty-nine thousand, eight hundred ninety-seven".