79691069 has 2 divisors, whose sum is σ = 79691070. Its totient is φ = 79691068.

The previous prime is 79691047. The next prime is 79691089. The reversal of 79691069 is 96019697.

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., 78765625 + 925444 = 8875^2 + 962^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79691069 is a prime.

It is a super-2 number, since 2×79691069² = 12701332956725522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79691089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39845534 + 39845535.

It is an arithmetic number, because the mean of its divisors is an integer number (39845535).

Almost surely, 2^79691069 is an apocalyptic number.

It is an amenable number.

79691069 is a deficient number, since it is larger than the sum of its proper divisors (1).

79691069 is an equidigital number, since it uses as much as digits as its factorization.

79691069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 183708, while the sum is 47.

The square root of 79691069 is about 8926.9854374251. The cubic root of 79691069 is about 430.3315794746.

The spelling of 79691069 in words is "seventy-nine million, six hundred ninety-one thousand, sixty-nine".