79163561 has 2 divisors, whose sum is σ = 79163562. Its totient is φ = 79163560.

The previous prime is 79163537. The next prime is 79163569. The reversal of 79163561 is 16536197.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76457536 + 2706025 = 8744^2 + 1645^2 .

It is an emirp because it is prime and its reverse (16536197) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79163561 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (79163569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39581780 + 39581781.

It is an arithmetic number, because the mean of its divisors is an integer number (39581781).

Almost surely, 2^79163561 is an apocalyptic number.

It is an amenable number.

79163561 is a deficient number, since it is larger than the sum of its proper divisors (1).

79163561 is an equidigital number, since it uses as much as digits as its factorization.

79163561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34020, while the sum is 38.

The square root of 79163561 is about 8897.3906849143. The cubic root of 79163561 is about 429.3799626874.

The spelling of 79163561 in words is "seventy-nine million, one hundred sixty-three thousand, five hundred sixty-one".