80518969 has 2 divisors, whose sum is σ = 80518970. Its totient is φ = 80518968.

The previous prime is 80518967. The next prime is 80518973. The reversal of 80518969 is 96981508.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48483369 + 32035600 = 6963^2 + 5660^2 .

It is a cyclic number.

It is not a de Polignac number, because 80518969 - 2¹ = 80518967 is a prime.

It is a super-2 number, since 2×80518969² = 12966608737645922, which contains 22 as substring.

Together with 80518967, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (80518967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40259484 + 40259485.

It is an arithmetic number, because the mean of its divisors is an integer number (40259485).

Almost surely, 2^80518969 is an apocalyptic number.

It is an amenable number.

80518969 is a deficient number, since it is larger than the sum of its proper divisors (1).

80518969 is an equidigital number, since it uses as much as digits as its factorization.

80518969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 46.

The square root of 80518969 is about 8973.2362612382. The cubic root of 80518969 is about 431.8166678218.

It can be divided in two parts, 8051 and 8969, that added together give a triangular number (17020 = T₁₈₄).

The spelling of 80518969 in words is "eighty million, five hundred eighteen thousand, nine hundred sixty-nine".