31116517 has 2 divisors, whose sum is σ = 31116518. Its totient is φ = 31116516.

The previous prime is 31116497. The next prime is 31116521. The reversal of 31116517 is 71561113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30980356 + 136161 = 5566^2 + 369^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31116517 is a prime.

It is a super-2 number, since 2×31116517² = 1936475260422578, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31116491 and 31116500.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31116577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15558258 + 15558259.

It is an arithmetic number, because the mean of its divisors is an integer number (15558259).

Almost surely, 2^31116517 is an apocalyptic number.

It is an amenable number.

31116517 is a deficient number, since it is larger than the sum of its proper divisors (1).

31116517 is an equidigital number, since it uses as much as digits as its factorization.

31116517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 630, while the sum is 25.

The square root of 31116517 is about 5578.2180846575. The cubic root of 31116517 is about 314.5311476300.

The spelling of 31116517 in words is "thirty-one million, one hundred sixteen thousand, five hundred seventeen".