79001921 has 2 divisors, whose sum is σ = 79001922. Its totient is φ = 79001920.

The previous prime is 79001891. The next prime is 79001933. The reversal of 79001921 is 12910097.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65044225 + 13957696 = 8065^2 + 3736^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79001921 is a prime.

It is not a weakly prime, because it can be changed into another prime (79501921) 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, 39500960 + 39500961.

It is an arithmetic number, because the mean of its divisors is an integer number (39500961).

Almost surely, 2^79001921 is an apocalyptic number.

It is an amenable number.

79001921 is a deficient number, since it is larger than the sum of its proper divisors (1).

79001921 is an equidigital number, since it uses as much as digits as its factorization.

79001921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134, while the sum is 29.

The square root of 79001921 is about 8888.3024813515. The cubic root of 79001921 is about 429.0875206088.

The spelling of 79001921 in words is "seventy-nine million, one thousand, nine hundred twenty-one".