80615891 has 2 divisors, whose sum is σ = 80615892. Its totient is φ = 80615890.

The previous prime is 80615867. The next prime is 80615923. The reversal of 80615891 is 19851608.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 80615891 - 2¹⁴ = 80599507 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (80615861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40307945 + 40307946.

It is an arithmetic number, because the mean of its divisors is an integer number (40307946).

Almost surely, 2^80615891 is an apocalyptic number.

80615891 is a deficient number, since it is larger than the sum of its proper divisors (1).

80615891 is an equidigital number, since it uses as much as digits as its factorization.

80615891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 80615891 is about 8978.6352526428. The cubic root of 80615891 is about 431.9898599443.

The spelling of 80615891 in words is "eighty million, six hundred fifteen thousand, eight hundred ninety-one".