89812581 has 32 divisors (see below), whose sum is σ = 130636800. Its totient is φ = 54672384.

The previous prime is 89812571. The next prime is 89812609. The reversal of 89812581 is 18521898.

It is not a de Polignac number, because 89812581 - 2¹⁴ = 89796197 is a prime.

It is a super-2 number, since 2×89812581² = 16132599411763122, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89812501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 402636 + ... + 402858.

It is an arithmetic number, because the mean of its divisors is an integer number (4082400).

Almost surely, 2^89812581 is an apocalyptic number.

89812581 is the 5066-th nonagonal number.

It is an amenable number.

89812581 is a deficient number, since it is larger than the sum of its proper divisors (40824219).

89812581 is a wasteful number, since it uses less digits than its factorization.

89812581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445.

The product of its digits is 46080, while the sum is 42.

The square root of 89812581 is about 9476.9499840402. The cubic root of 89812581 is about 447.8291842543.

The spelling of 89812581 in words is "eighty-nine million, eight hundred twelve thousand, five hundred eighty-one".