79560781 has 2 divisors, whose sum is σ = 79560782. Its totient is φ = 79560780.

The previous prime is 79560779. The next prime is 79560839. The reversal of 79560781 is 18706597.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64545156 + 15015625 = 8034^2 + 3875^2 .

It is a cyclic number.

It is not a de Polignac number, because 79560781 - 2¹ = 79560779 is a prime.

It is a super-2 number, since 2×79560781² = 12659835746659922, which contains 22 as substring.

Together with 79560779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79560721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39780390 + 39780391.

It is an arithmetic number, because the mean of its divisors is an integer number (39780391).

Almost surely, 2^79560781 is an apocalyptic number.

It is an amenable number.

79560781 is a deficient number, since it is larger than the sum of its proper divisors (1).

79560781 is an equidigital number, since it uses as much as digits as its factorization.

79560781 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 79560781 is about 8919.6850280713. The cubic root of 79560781 is about 430.0969332579.

The spelling of 79560781 in words is "seventy-nine million, five hundred sixty thousand, seven hundred eighty-one".