79372021 has 2 divisors, whose sum is σ = 79372022. Its totient is φ = 79372020.

The previous prime is 79372009. The next prime is 79372037. The reversal of 79372021 is 12027397.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42902500 + 36469521 = 6550^2 + 6039^2 .

It is a cyclic number.

It is not a de Polignac number, because 79372021 - 2⁷ = 79371893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79372061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39686010 + 39686011.

It is an arithmetic number, because the mean of its divisors is an integer number (39686011).

Almost surely, 2^79372021 is an apocalyptic number.

It is an amenable number.

79372021 is a deficient number, since it is larger than the sum of its proper divisors (1).

79372021 is an equidigital number, since it uses as much as digits as its factorization.

79372021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 79372021 is about 8909.0976535225. The cubic root of 79372021 is about 429.7565252267.

It can be divided in two parts, 79 and 372021, that added together give a square (372100 = 610²).

The spelling of 79372021 in words is "seventy-nine million, three hundred seventy-two thousand, twenty-one".