79061861 has 2 divisors, whose sum is σ = 79061862. Its totient is φ = 79061860.

The previous prime is 79061839. The next prime is 79061863. The reversal of 79061861 is 16816097.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50908225 + 28153636 = 7135^2 + 5306^2 .

It is a cyclic number.

It is not a de Polignac number, because 79061861 - 2⁶ = 79061797 is a prime.

Together with 79061863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79061863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39530930 + 39530931.

It is an arithmetic number, because the mean of its divisors is an integer number (39530931).

Almost surely, 2^79061861 is an apocalyptic number.

It is an amenable number.

79061861 is a deficient number, since it is larger than the sum of its proper divisors (1).

79061861 is an equidigital number, since it uses as much as digits as its factorization.

79061861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 79061861 is about 8891.6736894693. The cubic root of 79061861 is about 429.1960116590.

The spelling of 79061861 in words is "seventy-nine million, sixty-one thousand, eight hundred sixty-one".