80540561 has 2 divisors, whose sum is σ = 80540562. Its totient is φ = 80540560.

The previous prime is 80540533. The next prime is 80540617. The reversal of 80540561 is 16504508.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80209936 + 330625 = 8956^2 + 575^2 .

It is a cyclic number.

It is not a de Polignac number, because 80540561 - 2¹⁸ = 80278417 is a prime.

It is not a weakly prime, because it can be changed into another prime (80540521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40270280 + 40270281.

It is an arithmetic number, because the mean of its divisors is an integer number (40270281).

Almost surely, 2^80540561 is an apocalyptic number.

It is an amenable number.

80540561 is a deficient number, since it is larger than the sum of its proper divisors (1).

80540561 is an equidigital number, since it uses as much as digits as its factorization.

80540561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 80540561 is about 8974.4393139627. The cubic root of 80540561 is about 431.8552630841.

The spelling of 80540561 in words is "eighty million, five hundred forty thousand, five hundred sixty-one".