79611569 has 2 divisors, whose sum is σ = 79611570. Its totient is φ = 79611568.

The previous prime is 79611563. The next prime is 79611593. The reversal of 79611569 is 96511697.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57942544 + 21669025 = 7612^2 + 4655^2 .

It is a cyclic number.

It is not a de Polignac number, because 79611569 - 2²⁰ = 78562993 is a prime.

It is a super-2 number, since 2×79611569² = 12676003837283522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (79611563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39805784 + 39805785.

It is an arithmetic number, because the mean of its divisors is an integer number (39805785).

Almost surely, 2^79611569 is an apocalyptic number.

It is an amenable number.

79611569 is a deficient number, since it is larger than the sum of its proper divisors (1).

79611569 is an equidigital number, since it uses as much as digits as its factorization.

79611569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 102060, while the sum is 44.

The square root of 79611569 is about 8922.5315353884. The cubic root of 79611569 is about 430.1884319268.

The spelling of 79611569 in words is "seventy-nine million, six hundred eleven thousand, five hundred sixty-nine".