79501921 has 2 divisors, whose sum is σ = 79501922. Its totient is φ = 79501920.

The previous prime is 79501907. The next prime is 79501927. The reversal of 79501921 is 12910597.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66259600 + 13242321 = 8140^2 + 3639^2 .

It is a cyclic number.

It is not a de Polignac number, because 79501921 - 2¹⁷ = 79370849 is a prime.

It is not a weakly prime, because it can be changed into another prime (79501927) 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, 39750960 + 39750961.

It is an arithmetic number, because the mean of its divisors is an integer number (39750961).

Almost surely, 2^79501921 is an apocalyptic number.

It is an amenable number.

79501921 is a deficient number, since it is larger than the sum of its proper divisors (1).

79501921 is an equidigital number, since it uses as much as digits as its factorization.

79501921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5670, while the sum is 34.

The square root of 79501921 is about 8916.3849737436. The cubic root of 79501921 is about 429.9908435043.

The spelling of 79501921 in words is "seventy-nine million, five hundred one thousand, nine hundred twenty-one".