79945189 has 2 divisors, whose sum is σ = 79945190. Its totient is φ = 79945188.

The previous prime is 79945183. The next prime is 79945211. The reversal of 79945189 is 98154997.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66292164 + 13653025 = 8142^2 + 3695^2 .

It is a cyclic number.

It is not a de Polignac number, because 79945189 - 2¹⁵ = 79912421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79945183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39972594 + 39972595.

It is an arithmetic number, because the mean of its divisors is an integer number (39972595).

Almost surely, 2^79945189 is an apocalyptic number.

It is an amenable number.

79945189 is a deficient number, since it is larger than the sum of its proper divisors (1).

79945189 is an equidigital number, since it uses as much as digits as its factorization.

79945189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 52.

The square root of 79945189 is about 8941.2073569513. The cubic root of 79945189 is about 430.7885099242.

The spelling of 79945189 in words is "seventy-nine million, nine hundred forty-five thousand, one hundred eighty-nine".