80618891 has 2 divisors, whose sum is σ = 80618892. Its totient is φ = 80618890.

The previous prime is 80618861. The next prime is 80618899. The reversal of 80618891 is 19881608.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 80618891 - 2⁶ = 80618827 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (80618899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40309445 + 40309446.

It is an arithmetic number, because the mean of its divisors is an integer number (40309446).

Almost surely, 2^80618891 is an apocalyptic number.

80618891 is a deficient number, since it is larger than the sum of its proper divisors (1).

80618891 is an equidigital number, since it uses as much as digits as its factorization.

80618891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 41.

The square root of 80618891 is about 8978.8023143401. The cubic root of 80618891 is about 431.9952184970.

The spelling of 80618891 in words is "eighty million, six hundred eighteen thousand, eight hundred ninety-one".