31713391 has 8 divisors (see below), whose sum is σ = 32707584. Its totient is φ = 30732600.

The previous prime is 31713373. The next prime is 31713401. The reversal of 31713391 is 19331713.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31713391 - 2¹⁷ = 31582319 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31713491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1566 + ... + 8116.

It is an arithmetic number, because the mean of its divisors is an integer number (4088448).

Almost surely, 2^31713391 is an apocalyptic number.

31713391 is a deficient number, since it is larger than the sum of its proper divisors (994193).

31713391 is a wasteful number, since it uses less digits than its factorization.

31713391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6701.

The product of its digits is 1701, while the sum is 28.

The square root of 31713391 is about 5631.4643743879. The cubic root of 31713391 is about 316.5295259656.

The spelling of 31713391 in words is "thirty-one million, seven hundred thirteen thousand, three hundred ninety-one".