31397136 has 20 divisors (see below), whose sum is σ = 81109392. Its totient is φ = 10465696.

The previous prime is 31397129. The next prime is 31397143. The reversal of 31397136 is 63179313.

It is an interprime number because it is at equal distance from previous prime (31397129) and next prime (31397143).

It is a junction number, because it is equal to n+sod(n) for n = 31397097 and 31397106.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 327006 + ... + 327101.

Almost surely, 2^31397136 is an apocalyptic number.

It is an amenable number.

31397136 is an abundant number, since it is smaller than the sum of its proper divisors (49712256).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31397136 is a wasteful number, since it uses less digits than its factorization.

31397136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654118 (or 654112 counting only the distinct ones).

The product of its digits is 10206, while the sum is 33.

The square root of 31397136 is about 5603.3147332628. The cubic root of 31397136 is about 315.4738346281.

The spelling of 31397136 in words is "thirty-one million, three hundred ninety-seven thousand, one hundred thirty-six".