31616917 has 2 divisors, whose sum is σ = 31616918. Its totient is φ = 31616916.

The previous prime is 31616903. The next prime is 31616929. The reversal of 31616917 is 71961613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29877156 + 1739761 = 5466^2 + 1319^2 .

It is an emirp because it is prime and its reverse (71961613) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31616917 - 2¹⁹ = 31092629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31616987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15808458 + 15808459.

It is an arithmetic number, because the mean of its divisors is an integer number (15808459).

Almost surely, 2^31616917 is an apocalyptic number.

It is an amenable number.

31616917 is a deficient number, since it is larger than the sum of its proper divisors (1).

31616917 is an equidigital number, since it uses as much as digits as its factorization.

31616917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 34.

The square root of 31616917 is about 5622.8922273150. The cubic root of 31616917 is about 316.2082328047.

The spelling of 31616917 in words is "thirty-one million, six hundred sixteen thousand, nine hundred seventeen".