79231861 has 2 divisors, whose sum is σ = 79231862. Its totient is φ = 79231860.

The previous prime is 79231847. The next prime is 79231891. The reversal of 79231861 is 16813297.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78411025 + 820836 = 8855^2 + 906^2 .

It is a cyclic number.

It is not a de Polignac number, because 79231861 - 2⁵ = 79231829 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 79231861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79231891) 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, 39615930 + 39615931.

It is an arithmetic number, because the mean of its divisors is an integer number (39615931).

Almost surely, 2^79231861 is an apocalyptic number.

It is an amenable number.

79231861 is a deficient number, since it is larger than the sum of its proper divisors (1).

79231861 is an equidigital number, since it uses as much as digits as its factorization.

79231861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 37.

The square root of 79231861 is about 8901.2280613407. The cubic root of 79231861 is about 429.5034126731.

The spelling of 79231861 in words is "seventy-nine million, two hundred thirty-one thousand, eight hundred sixty-one".