79056781 has 2 divisors, whose sum is σ = 79056782. Its totient is φ = 79056780.

The previous prime is 79056767. The next prime is 79056829. The reversal of 79056781 is 18765097.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41344900 + 37711881 = 6430^2 + 6141^2 .

It is a cyclic number.

It is not a de Polignac number, because 79056781 - 2¹¹ = 79054733 is a prime.

It is a super-2 number, since 2×79056781² = 12499949244163922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79056281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39528390 + 39528391.

It is an arithmetic number, because the mean of its divisors is an integer number (39528391).

Almost surely, 2^79056781 is an apocalyptic number.

It is an amenable number.

79056781 is a deficient number, since it is larger than the sum of its proper divisors (1).

79056781 is an equidigital number, since it uses as much as digits as its factorization.

79056781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 43.

The square root of 79056781 is about 8891.3880243750. The cubic root of 79056781 is about 429.1868190158.

The spelling of 79056781 in words is "seventy-nine million, fifty-six thousand, seven hundred eighty-one".