99717255431 has 2 divisors, whose sum is σ = 99717255432. Its totient is φ = 99717255430.

The previous prime is 99717255373. The next prime is 99717255433. The reversal of 99717255431 is 13455271799.

It is a strong prime.

It is an emirp because it is prime and its reverse (13455271799) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99717255431 is a prime.

It is a super-2 number, since 2×99717255431² (a number of 23 digits) contains 22 as substring.

Together with 99717255433, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99717255433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49858627715 + 49858627716.

It is an arithmetic number, because the mean of its divisors is an integer number (49858627716).

Almost surely, 2^99717255431 is an apocalyptic number.

99717255431 is a deficient number, since it is larger than the sum of its proper divisors (1).

99717255431 is an equidigital number, since it uses as much as digits as its factorization.

99717255431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2381400, while the sum is 53.

The spelling of 99717255431 in words is "ninety-nine billion, seven hundred seventeen million, two hundred fifty-five thousand, four hundred thirty-one".