79634921 has 2 divisors, whose sum is σ = 79634922. Its totient is φ = 79634920.

The previous prime is 79634917. The next prime is 79634941. The reversal of 79634921 is 12943697.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71995225 + 7639696 = 8485^2 + 2764^2 .

It is a cyclic number.

It is not a de Polignac number, because 79634921 - 2² = 79634917 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (79634941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39817460 + 39817461.

It is an arithmetic number, because the mean of its divisors is an integer number (39817461).

Almost surely, 2^79634921 is an apocalyptic number.

It is an amenable number.

79634921 is a deficient number, since it is larger than the sum of its proper divisors (1).

79634921 is an equidigital number, since it uses as much as digits as its factorization.

79634921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 41.

The square root of 79634921 is about 8923.8400366658. The cubic root of 79634921 is about 430.2304893745.

The spelling of 79634921 in words is "seventy-nine million, six hundred thirty-four thousand, nine hundred twenty-one".