80531569 has 2 divisors, whose sum is σ = 80531570. Its totient is φ = 80531568.

The previous prime is 80531543. The next prime is 80531599. The reversal of 80531569 is 96513508.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69555600 + 10975969 = 8340^2 + 3313^2 .

It is a cyclic number.

It is not a de Polignac number, because 80531569 - 2¹⁹ = 80007281 is a prime.

It is a super-2 number, since 2×80531569² = 12970667211203522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (80531599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40265784 + 40265785.

It is an arithmetic number, because the mean of its divisors is an integer number (40265785).

Almost surely, 2^80531569 is an apocalyptic number.

It is an amenable number.

80531569 is a deficient number, since it is larger than the sum of its proper divisors (1).

80531569 is an equidigital number, since it uses as much as digits as its factorization.

80531569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 80531569 is about 8973.9383216066. The cubic root of 80531569 is about 431.8391909046.

The spelling of 80531569 in words is "eighty million, five hundred thirty-one thousand, five hundred sixty-nine".