79813897 has 2 divisors, whose sum is σ = 79813898. Its totient is φ = 79813896.

The previous prime is 79813781. The next prime is 79813901. The reversal of 79813897 is 79831897.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42981136 + 36832761 = 6556^2 + 6069^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79813897 is a prime.

It is not a weakly prime, because it can be changed into another prime (79814897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39906948 + 39906949.

It is an arithmetic number, because the mean of its divisors is an integer number (39906949).

Almost surely, 2^79813897 is an apocalyptic number.

It is an amenable number.

79813897 is a deficient number, since it is larger than the sum of its proper divisors (1).

79813897 is an equidigital number, since it uses as much as digits as its factorization.

79813897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 762048, while the sum is 52.

The square root of 79813897 is about 8933.8623786132. The cubic root of 79813897 is about 430.5525562836.

The spelling of 79813897 in words is "seventy-nine million, eight hundred thirteen thousand, eight hundred ninety-seven".