80861589 has 12 divisors (see below), whose sum is σ = 118401036. Its totient is φ = 53168832.

The previous prime is 80861533. The next prime is 80861591. The reversal of 80861589 is 98516808.

80861589 is a `hidden beast` number, since 8 + 0 + 8 + 61 + 589 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 40220964 + 40640625 = 6342^2 + 6375^2 .

It is not a de Polignac number, because 80861589 - 2¹² = 80857493 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80861189) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60882 + ... + 62195.

It is an arithmetic number, because the mean of its divisors is an integer number (9866753).

Almost surely, 2^80861589 is an apocalyptic number.

It is an amenable number.

80861589 is a deficient number, since it is larger than the sum of its proper divisors (37539447).

80861589 is a wasteful number, since it uses less digits than its factorization.

80861589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123156 (or 123153 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 80861589 is about 8992.3072122787. The cubic root of 80861589 is about 432.4282821821.

The spelling of 80861589 in words is "eighty million, eight hundred sixty-one thousand, five hundred eighty-nine".