79309481 has 2 divisors, whose sum is σ = 79309482. Its totient is φ = 79309480.

The previous prime is 79309453. The next prime is 79309493. The reversal of 79309481 is 18490397.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49224256 + 30085225 = 7016^2 + 5485^2 .

It is an emirp because it is prime and its reverse (18490397) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79309481 is a prime.

It is a super-2 number, since 2×79309481² = 12579987552978722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (79309081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39654740 + 39654741.

It is an arithmetic number, because the mean of its divisors is an integer number (39654741).

Almost surely, 2^79309481 is an apocalyptic number.

It is an amenable number.

79309481 is a deficient number, since it is larger than the sum of its proper divisors (1).

79309481 is an equidigital number, since it uses as much as digits as its factorization.

79309481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 79309481 is about 8905.5870665555. The cubic root of 79309481 is about 429.6436221536.

The spelling of 79309481 in words is "seventy-nine million, three hundred nine thousand, four hundred eighty-one".