79855891 has 2 divisors, whose sum is σ = 79855892. Its totient is φ = 79855890.

The previous prime is 79855849. The next prime is 79855903. The reversal of 79855891 is 19855897.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 79855891 - 2¹¹ = 79853843 is a prime.

It is not a weakly prime, because it can be changed into another prime (79855091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39927945 + 39927946.

It is an arithmetic number, because the mean of its divisors is an integer number (39927946).

Almost surely, 2^79855891 is an apocalyptic number.

79855891 is a deficient number, since it is larger than the sum of its proper divisors (1).

79855891 is an equidigital number, since it uses as much as digits as its factorization.

79855891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 907200, while the sum is 52.

The square root of 79855891 is about 8936.2123408075. The cubic root of 79855891 is about 430.6280546392.

The spelling of 79855891 in words is "seventy-nine million, eight hundred fifty-five thousand, eight hundred ninety-one".