99975679 has 2 divisors, whose sum is σ = 99975680. Its totient is φ = 99975678.

The previous prime is 99975661. The next prime is 99975683. The reversal of 99975679 is 97657999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99975679 - 2⁵ = 99975647 is a prime.

It is a super-2 number, since 2×99975679² = 19990272783022082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99975619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49987839 + 49987840.

It is an arithmetic number, because the mean of its divisors is an integer number (49987840).

Almost surely, 2^99975679 is an apocalyptic number.

99975679 is a deficient number, since it is larger than the sum of its proper divisors (1).

99975679 is an equidigital number, since it uses as much as digits as its factorization.

99975679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9644670, while the sum is 61.

The square root of 99975679 is about 9998.7838760521. The cubic root of 99975679 is about 464.1212509496.

The spelling of 99975679 in words is "ninety-nine million, nine hundred seventy-five thousand, six hundred seventy-nine".