97172917 has 2 divisors, whose sum is σ = 97172918. Its totient is φ = 97172916.

The previous prime is 97172857. The next prime is 97172963. The reversal of 97172917 is 71927179.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95082001 + 2090916 = 9751^2 + 1446^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97172917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97172987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48586458 + 48586459.

It is an arithmetic number, because the mean of its divisors is an integer number (48586459).

Almost surely, 2^97172917 is an apocalyptic number.

It is an amenable number.

97172917 is a deficient number, since it is larger than the sum of its proper divisors (1).

97172917 is an equidigital number, since it uses as much as digits as its factorization.

97172917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55566, while the sum is 43.

The square root of 97172917 is about 9857.6324236604. The cubic root of 97172917 is about 459.7429518513.

It can be divided in two parts, 97172 and 917, that added together give a palindrome (98089).

The spelling of 97172917 in words is "ninety-seven million, one hundred seventy-two thousand, nine hundred seventeen".