81074589 has 16 divisors (see below), whose sum is σ = 111089664. Its totient is φ = 52563200.

The previous prime is 81074573. The next prime is 81074593. The reversal of 81074589 is 98547018.

It is a cyclic number.

It is not a de Polignac number, because 81074589 - 2⁴ = 81074573 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 81074589.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81074509) 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, 46249 + ... + 47969.

It is an arithmetic number, because the mean of its divisors is an integer number (6943104).

Almost surely, 2^81074589 is an apocalyptic number.

It is an amenable number.

81074589 is a deficient number, since it is larger than the sum of its proper divisors (30015075).

81074589 is a wasteful number, since it uses less digits than its factorization.

81074589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2148.

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 81074589 is about 9004.1428798082. The cubic root of 81074589 is about 432.8076401658.

The spelling of 81074589 in words is "eighty-one million, seventy-four thousand, five hundred eighty-nine".