31145717 has 16 divisors (see below), whose sum is σ = 34100352. Its totient is φ = 28331520.

The previous prime is 31145711. The next prime is 31145729. The reversal of 31145717 is 71754113.

It is not a de Polignac number, because 31145717 - 2⁴ = 31145701 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 31145717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31145711) 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, 99992 + ... + 100302.

It is an arithmetic number, because the mean of its divisors is an integer number (2131272).

Almost surely, 2^31145717 is an apocalyptic number.

It is an amenable number.

31145717 is a deficient number, since it is larger than the sum of its proper divisors (2954635).

31145717 is a wasteful number, since it uses less digits than its factorization.

31145717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508.

The product of its digits is 2940, while the sum is 29.

The square root of 31145717 is about 5580.8347941863. The cubic root of 31145717 is about 314.6295030911.

The spelling of 31145717 in words is "thirty-one million, one hundred forty-five thousand, seven hundred seventeen".