97991317 has 2 divisors, whose sum is σ = 97991318. Its totient is φ = 97991316.

The previous prime is 97991291. The next prime is 97991321. The reversal of 97991317 is 71319979.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84382596 + 13608721 = 9186^2 + 3689^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97991317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97991717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48995658 + 48995659.

It is an arithmetic number, because the mean of its divisors is an integer number (48995659).

Almost surely, 2^97991317 is an apocalyptic number.

It is an amenable number.

97991317 is a deficient number, since it is larger than the sum of its proper divisors (1).

97991317 is an equidigital number, since it uses as much as digits as its factorization.

97991317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 107163, while the sum is 46.

The square root of 97991317 is about 9899.0563691697. The cubic root of 97991317 is about 461.0300123349.

The spelling of 97991317 in words is "ninety-seven million, nine hundred ninety-one thousand, three hundred seventeen".