79541557 has 2 divisors, whose sum is σ = 79541558. Its totient is φ = 79541556.

The previous prime is 79541549. The next prime is 79541563. The reversal of 79541557 is 75514597.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78163281 + 1378276 = 8841^2 + 1174^2 .

It is a cyclic number.

It is not a de Polignac number, because 79541557 - 2³ = 79541549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79541857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39770778 + 39770779.

It is an arithmetic number, because the mean of its divisors is an integer number (39770779).

Almost surely, 2^79541557 is an apocalyptic number.

It is an amenable number.

79541557 is a deficient number, since it is larger than the sum of its proper divisors (1).

79541557 is an equidigital number, since it uses as much as digits as its factorization.

79541557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 220500, while the sum is 43.

The square root of 79541557 is about 8918.6073464415. The cubic root of 79541557 is about 430.0622895161.

The spelling of 79541557 in words is "seventy-nine million, five hundred forty-one thousand, five hundred fifty-seven".