79561619 has 2 divisors, whose sum is σ = 79561620. Its totient is φ = 79561618.

The previous prime is 79561609. The next prime is 79561633. The reversal of 79561619 is 91616597.

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-79561619 is a prime.

It is a super-2 number, since 2×79561619² = 12660102435802322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 79561619.

It is not a weakly prime, because it can be changed into another prime (79561609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39780809 + 39780810.

It is an arithmetic number, because the mean of its divisors is an integer number (39780810).

Almost surely, 2^79561619 is an apocalyptic number.

79561619 is a deficient number, since it is larger than the sum of its proper divisors (1).

79561619 is an equidigital number, since it uses as much as digits as its factorization.

79561619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 102060, while the sum is 44.

The square root of 79561619 is about 8919.7320027005. The cubic root of 79561619 is about 430.0984432983.

The spelling of 79561619 in words is "seventy-nine million, five hundred sixty-one thousand, six hundred nineteen".