80531561 has 16 divisors (see below), whose sum is σ = 90953280. Its totient is φ = 70667520.

The previous prime is 80531543. The next prime is 80531569. The reversal of 80531561 is 16513508.

It is not a de Polignac number, because 80531561 - 2²⁶ = 13422697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80531569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41141 + ... + 43053.

It is an arithmetic number, because the mean of its divisors is an integer number (5684580).

Almost surely, 2^80531561 is an apocalyptic number.

It is an amenable number.

80531561 is a deficient number, since it is larger than the sum of its proper divisors (10421719).

80531561 is a wasteful number, since it uses less digits than its factorization.

80531561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2056.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 80531561 is about 8973.9378758714. The cubic root of 80531561 is about 431.8391766050.

The spelling of 80531561 in words is "eighty million, five hundred thirty-one thousand, five hundred sixty-one".