79819897 has 2 divisors, whose sum is σ = 79819898. Its totient is φ = 79819896.

The previous prime is 79819877. The next prime is 79819921. The reversal of 79819897 is 79891897.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61638201 + 18181696 = 7851^2 + 4264^2 .

It is a cyclic number.

It is not a de Polignac number, because 79819897 - 2⁷ = 79819769 is a prime.

It is not a weakly prime, because it can be changed into another prime (79819807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39909948 + 39909949.

It is an arithmetic number, because the mean of its divisors is an integer number (39909949).

Almost surely, 2^79819897 is an apocalyptic number.

It is an amenable number.

79819897 is a deficient number, since it is larger than the sum of its proper divisors (1).

79819897 is an equidigital number, since it uses as much as digits as its factorization.

79819897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2286144, while the sum is 58.

The square root of 79819897 is about 8934.1981733114. The cubic root of 79819897 is about 430.5633449253.

The spelling of 79819897 in words is "seventy-nine million, eight hundred nineteen thousand, eight hundred ninety-seven".