79891097 has 12 divisors (see below), whose sum is σ = 94570980. Its totient is φ = 67040160.

The previous prime is 79891081. The next prime is 79891111. The reversal of 79891097 is 79019897.

It can be written as a sum of positive squares in 2 ways, for example, as 7027801 + 72863296 = 2651^2 + 8536^2 .

It is not a de Polignac number, because 79891097 - 2⁴ = 79891081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79891037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23822 + ... + 26967.

It is an arithmetic number, because the mean of its divisors is an integer number (7880915).

Almost surely, 2^79891097 is an apocalyptic number.

It is an amenable number.

79891097 is a deficient number, since it is larger than the sum of its proper divisors (14679883).

79891097 is a wasteful number, since it uses less digits than its factorization.

79891097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50824 (or 50813 counting only the distinct ones).

The product of its (nonzero) digits is 285768, while the sum is 50.

The square root of 79891097 is about 8938.1819739811. The cubic root of 79891097 is about 430.6913288852.

The spelling of 79891097 in words is "seventy-nine million, eight hundred ninety-one thousand, ninety-seven".