80511979 has 2 divisors, whose sum is σ = 80511980. Its totient is φ = 80511978.

The previous prime is 80511971. The next prime is 80512013. The reversal of 80511979 is 97911508.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 80511979 - 2³ = 80511971 is a prime.

It is not a weakly prime, because it can be changed into another prime (80511971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40255989 + 40255990.

It is an arithmetic number, because the mean of its divisors is an integer number (40255990).

Almost surely, 2^80511979 is an apocalyptic number.

80511979 is a deficient number, since it is larger than the sum of its proper divisors (1).

80511979 is an equidigital number, since it uses as much as digits as its factorization.

80511979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 40.

The square root of 80511979 is about 8972.8467612013. The cubic root of 80511979 is about 431.8041718601.

The spelling of 80511979 in words is "eighty million, five hundred eleven thousand, nine hundred seventy-nine".