79991827 has 2 divisors, whose sum is σ = 79991828. Its totient is φ = 79991826.

The previous prime is 79991819. The next prime is 79991897. The reversal of 79991827 is 72819997.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 79991827 - 2³ = 79991819 is a prime.

It is not a weakly prime, because it can be changed into another prime (79991897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39995913 + 39995914.

It is an arithmetic number, because the mean of its divisors is an integer number (39995914).

Almost surely, 2^79991827 is an apocalyptic number.

79991827 is a deficient number, since it is larger than the sum of its proper divisors (1).

79991827 is an equidigital number, since it uses as much as digits as its factorization.

79991827 is an evil number, because the sum of its binary digits is even.

The product of its digits is 571536, while the sum is 52.

The square root of 79991827 is about 8943.8150137399. The cubic root of 79991827 is about 430.8722640111.

The spelling of 79991827 in words is "seventy-nine million, nine hundred ninety-one thousand, eight hundred twenty-seven".