79829881 has 2 divisors, whose sum is σ = 79829882. Its totient is φ = 79829880.

The previous prime is 79829873. The next prime is 79829917. The reversal of 79829881 is 18892897.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75968656 + 3861225 = 8716^2 + 1965^2 .

It is a cyclic number.

It is not a de Polignac number, because 79829881 - 2³ = 79829873 is a prime.

It is a super-2 number, since 2×79829881² = 12745619800948322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (79829821) 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, 39914940 + 39914941.

It is an arithmetic number, because the mean of its divisors is an integer number (39914941).

Almost surely, 2^79829881 is an apocalyptic number.

It is an amenable number.

79829881 is a deficient number, since it is larger than the sum of its proper divisors (1).

79829881 is an equidigital number, since it uses as much as digits as its factorization.

79829881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 52.

The square root of 79829881 is about 8934.7569077172. The cubic root of 79829881 is about 430.5812960267.

The spelling of 79829881 in words is "seventy-nine million, eight hundred twenty-nine thousand, eight hundred eighty-one".