99564979 has 2 divisors, whose sum is σ = 99564980. Its totient is φ = 99564978.

The previous prime is 99564973. The next prime is 99565003. The reversal of 99564979 is 97946599.

It is a weak prime.

It is an emirp because it is prime and its reverse (97946599) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99564979 - 2⁵ = 99564947 is a prime.

It is not a weakly prime, because it can be changed into another prime (99564973) 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, 49782489 + 49782490.

It is an arithmetic number, because the mean of its divisors is an integer number (49782490).

Almost surely, 2^99564979 is an apocalyptic number.

99564979 is a deficient number, since it is larger than the sum of its proper divisors (1).

99564979 is an equidigital number, since it uses as much as digits as its factorization.

99564979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5511240, while the sum is 58.

The square root of 99564979 is about 9978.2252429979. The cubic root of 99564979 is about 463.4848421354.

The spelling of 99564979 in words is "ninety-nine million, five hundred sixty-four thousand, nine hundred seventy-nine".