79866121 has 2 divisors, whose sum is σ = 79866122. Its totient is φ = 79866120.

The previous prime is 79866107. The next prime is 79866133. The reversal of 79866121 is 12166897.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69555600 + 10310521 = 8340^2 + 3211^2 .

It is a cyclic number.

It is not a de Polignac number, because 79866121 - 2⁵ = 79866089 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (79866151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39933060 + 39933061.

It is an arithmetic number, because the mean of its divisors is an integer number (39933061).

Almost surely, 2^79866121 is an apocalyptic number.

It is an amenable number.

79866121 is a deficient number, since it is larger than the sum of its proper divisors (1).

79866121 is an equidigital number, since it uses as much as digits as its factorization.

79866121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 40.

The square root of 79866121 is about 8936.7847126357. The cubic root of 79866121 is about 430.6464424995.

The spelling of 79866121 in words is "seventy-nine million, eight hundred sixty-six thousand, one hundred twenty-one".