31713409 has 16 divisors (see below), whose sum is σ = 39408768. Its totient is φ = 24849792.

The previous prime is 31713401. The next prime is 31713433. The reversal of 31713409 is 90431713.

It is a cyclic number.

It is not a de Polignac number, because 31713409 - 2³ = 31713401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31713401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8109 + ... + 11365.

It is an arithmetic number, because the mean of its divisors is an integer number (2463048).

Almost surely, 2^31713409 is an apocalyptic number.

It is an amenable number.

31713409 is a deficient number, since it is larger than the sum of its proper divisors (7695359).

31713409 is a wasteful number, since it uses less digits than its factorization.

31713409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3384.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 31713409 is about 5631.4659725510. The cubic root of 31713409 is about 316.5295858512.

The spelling of 31713409 in words is "thirty-one million, seven hundred thirteen thousand, four hundred nine".