7979581 has 2 divisors, whose sum is σ = 7979582. Its totient is φ = 7979580.

The previous prime is 7979567. The next prime is 7979599. The reversal of 7979581 is 1859797.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7868025 + 111556 = 2805^2 + 334^2 .

It is a cyclic number.

It is not a de Polignac number, because 7979581 - 2⁵ = 7979549 is a prime.

It is a super-2 number, since 2×7979581² = 127347425871122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7979501) 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, 3989790 + 3989791.

It is an arithmetic number, because the mean of its divisors is an integer number (3989791).

Almost surely, 2^7979581 is an apocalyptic number.

It is an amenable number.

7979581 is a deficient number, since it is larger than the sum of its proper divisors (1).

7979581 is an equidigital number, since it uses as much as digits as its factorization.

7979581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 158760, while the sum is 46.

The square root of 7979581 is about 2824.8152151955. The cubic root of 7979581 is about 199.8296966917.

The spelling of 7979581 in words is "seven million, nine hundred seventy-nine thousand, five hundred eighty-one".