99812579 has 2 divisors, whose sum is σ = 99812580. Its totient is φ = 99812578.

The previous prime is 99812551. The next prime is 99812633. The reversal of 99812579 is 97521899.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99812579 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (99812539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49906289 + 49906290.

It is an arithmetic number, because the mean of its divisors is an integer number (49906290).

Almost surely, 2^99812579 is an apocalyptic number.

99812579 is a deficient number, since it is larger than the sum of its proper divisors (1).

99812579 is an equidigital number, since it uses as much as digits as its factorization.

99812579 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 50.

The square root of 99812579 is about 9990.6245550516. The cubic root of 99812579 is about 463.8687249395.

The spelling of 99812579 in words is "ninety-nine million, eight hundred twelve thousand, five hundred seventy-nine".