79621513 has 2 divisors, whose sum is σ = 79621514. Its totient is φ = 79621512.

The previous prime is 79621511. The next prime is 79621537. The reversal of 79621513 is 31512697.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76265289 + 3356224 = 8733^2 + 1832^2 .

It is a cyclic number.

It is not a de Polignac number, because 79621513 - 2¹ = 79621511 is a prime.

Together with 79621511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (79621511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39810756 + 39810757.

It is an arithmetic number, because the mean of its divisors is an integer number (39810757).

Almost surely, 2^79621513 is an apocalyptic number.

It is an amenable number.

79621513 is a deficient number, since it is larger than the sum of its proper divisors (1).

79621513 is an equidigital number, since it uses as much as digits as its factorization.

79621513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 34.

The square root of 79621513 is about 8923.0887589444. The cubic root of 79621513 is about 430.2063422872.

The spelling of 79621513 in words is "seventy-nine million, six hundred twenty-one thousand, five hundred thirteen".