79369861 has 2 divisors, whose sum is σ = 79369862. Its totient is φ = 79369860.

The previous prime is 79369841. The next prime is 79369949. The reversal of 79369861 is 16896397.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76020961 + 3348900 = 8719^2 + 1830^2 .

It is a cyclic number.

It is not a de Polignac number, because 79369861 - 2⁷ = 79369733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79369831) 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, 39684930 + 39684931.

It is an arithmetic number, because the mean of its divisors is an integer number (39684931).

Almost surely, 2^79369861 is an apocalyptic number.

It is an amenable number.

79369861 is a deficient number, since it is larger than the sum of its proper divisors (1).

79369861 is an equidigital number, since it uses as much as digits as its factorization.

79369861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 49.

The square root of 79369861 is about 8908.9764282997. The cubic root of 79369861 is about 429.7526267812.

The spelling of 79369861 in words is "seventy-nine million, three hundred sixty-nine thousand, eight hundred sixty-one".