79881097 has 2 divisors, whose sum is σ = 79881098. Its totient is φ = 79881096.

The previous prime is 79881089. The next prime is 79881101. The reversal of 79881097 is 79018897.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79762761 + 118336 = 8931^2 + 344^2 .

It is a cyclic number.

It is not a de Polignac number, because 79881097 - 2³ = 79881089 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 79881097.

It is not a weakly prime, because it can be changed into another prime (79881007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39940548 + 39940549.

It is an arithmetic number, because the mean of its divisors is an integer number (39940549).

Almost surely, 2^79881097 is an apocalyptic number.

It is an amenable number.

79881097 is a deficient number, since it is larger than the sum of its proper divisors (1).

79881097 is an equidigital number, since it uses as much as digits as its factorization.

79881097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 49.

The square root of 79881097 is about 8937.6225586002. The cubic root of 79881097 is about 430.6733582011.

The spelling of 79881097 in words is "seventy-nine million, eight hundred eighty-one thousand, ninety-seven".