31697425 has 6 divisors (see below), whose sum is σ = 39304838. Its totient is φ = 25357920.

The previous prime is 31697399. The next prime is 31697437. The reversal of 31697425 is 52479613.

It can be written as a sum of positive squares in 3 ways, for example, as 5564881 + 26132544 = 2359^2 + 5112^2 .

It is not a de Polignac number, because 31697425 - 2⁷ = 31697297 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 633924 + ... + 633973.

Almost surely, 2^31697425 is an apocalyptic number.

It is an amenable number.

31697425 is a deficient number, since it is larger than the sum of its proper divisors (7607413).

31697425 is a wasteful number, since it uses less digits than its factorization.

31697425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1267907 (or 1267902 counting only the distinct ones).

The product of its digits is 45360, while the sum is 37.

The square root of 31697425 is about 5630.0466250290. The cubic root of 31697425 is about 316.4763984740.

The spelling of 31697425 in words is "thirty-one million, six hundred ninety-seven thousand, four hundred twenty-five".