99940579 has 2 divisors, whose sum is σ = 99940580. Its totient is φ = 99940578.

The previous prime is 99940573. The next prime is 99940597. The reversal of 99940579 is 97504999.

Together with next prime (99940597) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99940579 - 2³ = 99940571 is a prime.

It is not a weakly prime, because it can be changed into another prime (99940571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49970289 + 49970290.

It is an arithmetic number, because the mean of its divisors is an integer number (49970290).

Almost surely, 2^99940579 is an apocalyptic number.

99940579 is a deficient number, since it is larger than the sum of its proper divisors (1).

99940579 is an equidigital number, since it uses as much as digits as its factorization.

99940579 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 918540, while the sum is 52.

The square root of 99940579 is about 9997.0285085119. The cubic root of 99940579 is about 464.0669291955.

The spelling of 99940579 in words is "ninety-nine million, nine hundred forty thousand, five hundred seventy-nine".