79945457 has 2 divisors, whose sum is σ = 79945458. Its totient is φ = 79945456.

The previous prime is 79945429. The next prime is 79945487. The reversal of 79945457 is 75454997.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78872161 + 1073296 = 8881^2 + 1036^2 .

It is an emirp because it is prime and its reverse (75454997) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79945457 - 2²⁴ = 63168241 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (79945427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39972728 + 39972729.

It is an arithmetic number, because the mean of its divisors is an integer number (39972729).

Almost surely, 2^79945457 is an apocalyptic number.

It is an amenable number.

79945457 is a deficient number, since it is larger than the sum of its proper divisors (1).

79945457 is an equidigital number, since it uses as much as digits as its factorization.

79945457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1587600, while the sum is 50.

The square root of 79945457 is about 8941.2223437291. Note that the first 3 decimals coincide. The cubic root of 79945457 is about 430.7889913006.

The spelling of 79945457 in words is "seventy-nine million, nine hundred forty-five thousand, four hundred fifty-seven".