79212689 has 2 divisors, whose sum is σ = 79212690. Its totient is φ = 79212688.

The previous prime is 79212649. The next prime is 79212701. The reversal of 79212689 is 98621297.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78145600 + 1067089 = 8840^2 + 1033^2 .

It is a cyclic number.

It is not a de Polignac number, because 79212689 - 2⁸ = 79212433 is a prime.

It is a super-2 number, since 2×79212689² = 12549300197221442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (79212619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39606344 + 39606345.

It is an arithmetic number, because the mean of its divisors is an integer number (39606345).

Almost surely, 2^79212689 is an apocalyptic number.

It is an amenable number.

79212689 is a deficient number, since it is larger than the sum of its proper divisors (1).

79212689 is an equidigital number, since it uses as much as digits as its factorization.

79212689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 44.

The square root of 79212689 is about 8900.1510661337. The cubic root of 79212689 is about 429.4687670832.

The spelling of 79212689 in words is "seventy-nine million, two hundred twelve thousand, six hundred eighty-nine".