31286997 has 24 divisors (see below), whose sum is σ = 52363584. Its totient is φ = 17630784.

The previous prime is 31286963. The next prime is 31287001. The reversal of 31286997 is 79968213.

It is not a de Polignac number, because 31286997 - 2⁸ = 31286741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31286917) 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, 1198 + ... + 8000.

It is an arithmetic number, because the mean of its divisors is an integer number (2181816).

Almost surely, 2^31286997 is an apocalyptic number.

It is an amenable number.

31286997 is a deficient number, since it is larger than the sum of its proper divisors (21076587).

31286997 is a wasteful number, since it uses less digits than its factorization.

31286997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6889 (or 6886 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 31286997 is about 5593.4780771895. The cubic root of 31286997 is about 315.1045155829.

The spelling of 31286997 in words is "thirty-one million, two hundred eighty-six thousand, nine hundred ninety-seven".