79151521 has 2 divisors, whose sum is σ = 79151522. Its totient is φ = 79151520.

The previous prime is 79151489. The next prime is 79151531. The reversal of 79151521 is 12515197.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76475025 + 2676496 = 8745^2 + 1636^2 .

It is a cyclic number.

It is not a de Polignac number, because 79151521 - 2⁵ = 79151489 is a prime.

It is a super-2 number, since 2×79151521² = 12529926553226882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (79151531) 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, 39575760 + 39575761.

It is an arithmetic number, because the mean of its divisors is an integer number (39575761).

Almost surely, 2^79151521 is an apocalyptic number.

It is an amenable number.

79151521 is a deficient number, since it is larger than the sum of its proper divisors (1).

79151521 is an equidigital number, since it uses as much as digits as its factorization.

79151521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3150, while the sum is 31.

The square root of 79151521 is about 8896.7140563244. The cubic root of 79151521 is about 429.3581934255.

The spelling of 79151521 in words is "seventy-nine million, one hundred fifty-one thousand, five hundred twenty-one".