31317923 has 8 divisors (see below), whose sum is σ = 38545248. Its totient is φ = 24778944.

The previous prime is 31317911. The next prime is 31317931. The reversal of 31317923 is 32971313.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31317923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31317953) 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, 171986 + ... + 172167.

It is an arithmetic number, because the mean of its divisors is an integer number (4818156).

Almost surely, 2^31317923 is an apocalyptic number.

31317923 is a deficient number, since it is larger than the sum of its proper divisors (7227325).

31317923 is a wasteful number, since it uses less digits than its factorization.

31317923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344173.

The product of its digits is 3402, while the sum is 29.

The square root of 31317923 is about 5596.2418639655. The cubic root of 31317923 is about 315.2083043143.

The spelling of 31317923 in words is "thirty-one million, three hundred seventeen thousand, nine hundred twenty-three".