31393609 has 9 divisors (see below), whose sum is σ = 34073319. Its totient is φ = 28911480.

The previous prime is 31393561. The next prime is 31393619. The reversal of 31393609 is 90639313.

It is a happy number.

The square root of 31393609 is 5603.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 4644025 + 26749584 = 2155^2 + 5172^2 .

It is not a de Polignac number, because 31393609 - 2⁹ = 31393097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31393619) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 72624 + ... + 73054.

Almost surely, 2^31393609 is an apocalyptic number.

31393609 is the 5603-rd square number.

31393609 is the 2802-nd centered octagonal number.

It is an amenable number.

31393609 is a deficient number, since it is larger than the sum of its proper divisors (2679710).

31393609 is an frugal number, since it uses more digits than its factorization.

31393609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888 (or 444 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 34.

The cubic root of 31393609 is about 315.4620212589.

The spelling of 31393609 in words is "thirty-one million, three hundred ninety-three thousand, six hundred nine".