99972317 has 2 divisors, whose sum is σ = 99972318. Its totient is φ = 99972316.

The previous prime is 99972311. The next prime is 99972403. The reversal of 99972317 is 71327999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99580441 + 391876 = 9979^2 + 626^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99972317 is a prime.

It is a Chen prime.

It is equal to p_5759957 and since 99972317 and 5759957 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99972311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49986158 + 49986159.

It is an arithmetic number, because the mean of its divisors is an integer number (49986159).

Almost surely, 2^99972317 is an apocalyptic number.

It is an amenable number.

99972317 is a deficient number, since it is larger than the sum of its proper divisors (1).

99972317 is an equidigital number, since it uses as much as digits as its factorization.

99972317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 214326, while the sum is 47.

The square root of 99972317 is about 9998.6157541932. The cubic root of 99972317 is about 464.1160483738.

The spelling of 99972317 in words is "ninety-nine million, nine hundred seventy-two thousand, three hundred seventeen".