79814521 has 2 divisors, whose sum is σ = 79814522. Its totient is φ = 79814520.

The previous prime is 79814453. The next prime is 79814549. The reversal of 79814521 is 12541897.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67815225 + 11999296 = 8235^2 + 3464^2 .

It is an emirp because it is prime and its reverse (12541897) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79814521 - 2¹⁵ = 79781753 is a prime.

It is not a weakly prime, because it can be changed into another prime (79811521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39907260 + 39907261.

It is an arithmetic number, because the mean of its divisors is an integer number (39907261).

Almost surely, 2^79814521 is an apocalyptic number.

It is an amenable number.

79814521 is a deficient number, since it is larger than the sum of its proper divisors (1).

79814521 is an equidigital number, since it uses as much as digits as its factorization.

79814521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 37.

The square root of 79814521 is about 8933.8973018498. The cubic root of 79814521 is about 430.5536783275.

The spelling of 79814521 in words is "seventy-nine million, eight hundred fourteen thousand, five hundred twenty-one".