79945913 has 2 divisors, whose sum is σ = 79945914. Its totient is φ = 79945912.

The previous prime is 79945903. The next prime is 79945927. The reversal of 79945913 is 31954997.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74874409 + 5071504 = 8653^2 + 2252^2 .

It is a cyclic number.

It is not a de Polignac number, because 79945913 - 2¹⁰ = 79944889 is a prime.

It is not a weakly prime, because it can be changed into another prime (79945903) 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, 39972956 + 39972957.

It is an arithmetic number, because the mean of its divisors is an integer number (39972957).

Almost surely, 2^79945913 is an apocalyptic number.

It is an amenable number.

79945913 is a deficient number, since it is larger than the sum of its proper divisors (1).

79945913 is an equidigital number, since it uses as much as digits as its factorization.

79945913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 306180, while the sum is 47.

The square root of 79945913 is about 8941.2478435619. The cubic root of 79945913 is about 430.7898103566.

The spelling of 79945913 in words is "seventy-nine million, nine hundred forty-five thousand, nine hundred thirteen".