79956581 has 2 divisors, whose sum is σ = 79956582. Its totient is φ = 79956580.

The previous prime is 79956563. The next prime is 79956599. The reversal of 79956581 is 18565997.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (79956563) and next prime (79956599).

It can be written as a sum of positive squares in only one way, i.e., 65448100 + 14508481 = 8090^2 + 3809^2 .

It is an emirp because it is prime and its reverse (18565997) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79956581 - 2¹⁴ = 79940197 is a prime.

It is a super-2 number, since 2×79956581² = 12786109690419122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79956521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39978290 + 39978291.

It is an arithmetic number, because the mean of its divisors is an integer number (39978291).

Almost surely, 2^79956581 is an apocalyptic number.

It is an amenable number.

79956581 is a deficient number, since it is larger than the sum of its proper divisors (1).

79956581 is an equidigital number, since it uses as much as digits as its factorization.

79956581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 680400, while the sum is 50.

The square root of 79956581 is about 8941.8443846893. The cubic root of 79956581 is about 430.8089710663.

The spelling of 79956581 in words is "seventy-nine million, nine hundred fifty-six thousand, five hundred eighty-one".