31316717 has 4 divisors (see below), whose sum is σ = 31377120. Its totient is φ = 31256316.

The previous prime is 31316713. The next prime is 31316749. The reversal of 31316717 is 71761313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71761313 = 13 ⋅5520101.

It is a cyclic number.

It is not a de Polignac number, because 31316717 - 2² = 31316713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31316717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31316713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29417 + ... + 30462.

It is an arithmetic number, because the mean of its divisors is an integer number (7844280).

Almost surely, 2^31316717 is an apocalyptic number.

It is an amenable number.

31316717 is a deficient number, since it is larger than the sum of its proper divisors (60403).

31316717 is an equidigital number, since it uses as much as digits as its factorization.

31316717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60402.

The product of its digits is 2646, while the sum is 29.

The square root of 31316717 is about 5596.1341120456. The cubic root of 31316717 is about 315.2042582170.

The spelling of 31316717 in words is "thirty-one million, three hundred sixteen thousand, seven hundred seventeen".