16317931 has 6 divisors (see below), whose sum is σ = 18982140. Its totient is φ = 13986756.

The previous prime is 16317929. The next prime is 16317947. The reversal of 16317931 is 13971361.

It is not a de Polignac number, because 16317931 - 2¹ = 16317929 is a prime.

It is a super-2 number, since 2×16317931² = 532549744241522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16317893 and 16317902.

It is not an unprimeable number, because it can be changed into a prime (16312931) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 166461 + ... + 166558.

It is an arithmetic number, because the mean of its divisors is an integer number (3163690).

Almost surely, 2^16317931 is an apocalyptic number.

16317931 is a deficient number, since it is larger than the sum of its proper divisors (2664209).

16317931 is an equidigital number, since it uses as much as digits as its factorization.

16317931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333033 (or 333026 counting only the distinct ones).

The product of its digits is 3402, while the sum is 31.

The square root of 16317931 is about 4039.5458903199. The cubic root of 16317931 is about 253.6423086424.

The spelling of 16317931 in words is "sixteen million, three hundred seventeen thousand, nine hundred thirty-one".