79866949 has 2 divisors, whose sum is σ = 79866950. Its totient is φ = 79866948.

The previous prime is 79866883. The next prime is 79866961. The reversal of 79866949 is 94966897.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45562500 + 34304449 = 6750^2 + 5857^2 .

It is a cyclic number.

It is not a de Polignac number, because 79866949 - 2⁷ = 79866821 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 79866893 and 79866902.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79866989) 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 as a sum of consecutive naturals, namely, 39933474 + 39933475.

It is an arithmetic number, because the mean of its divisors is an integer number (39933475).

Almost surely, 2^79866949 is an apocalyptic number.

It is an amenable number.

79866949 is a deficient number, since it is larger than the sum of its proper divisors (1).

79866949 is an equidigital number, since it uses as much as digits as its factorization.

79866949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5878656, while the sum is 58.

The square root of 79866949 is about 8936.8310379015. The cubic root of 79866949 is about 430.6479307151.

The spelling of 79866949 in words is "seventy-nine million, eight hundred sixty-six thousand, nine hundred forty-nine".