79747169 has 2 divisors, whose sum is σ = 79747170. Its totient is φ = 79747168.

The previous prime is 79747127. The next prime is 79747181. The reversal of 79747169 is 96174797.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63043600 + 16703569 = 7940^2 + 4087^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79747169 is a prime.

It is a super-2 number, since 2×79747169² = 12719221927029122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (79749169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39873584 + 39873585.

It is an arithmetic number, because the mean of its divisors is an integer number (39873585).

Almost surely, 2^79747169 is an apocalyptic number.

It is an amenable number.

79747169 is a deficient number, since it is larger than the sum of its proper divisors (1).

79747169 is an equidigital number, since it uses as much as digits as its factorization.

79747169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 666792, while the sum is 50.

The square root of 79747169 is about 8930.1270427693. The cubic root of 79747169 is about 430.4325357430.

The spelling of 79747169 in words is "seventy-nine million, seven hundred forty-seven thousand, one hundred sixty-nine".