181090494 has 48 divisors (see below), whose sum is σ = 447409872. Its totient is φ = 52441344.

The previous prime is 181090489. The next prime is 181090513. The reversal of 181090494 is 494090181.

181090494 is a `hidden beast` number, since 1 + 81 + 0 + 90 + 494 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18784 + ... + 26739.

It is an arithmetic number, because the mean of its divisors is an integer number (9321039).

Almost surely, 2^181090494 is an apocalyptic number.

181090494 is an abundant number, since it is smaller than the sum of its proper divisors (266319378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

181090494 is a wasteful number, since it uses less digits than its factorization.

181090494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45561 (or 45558 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 181090494 is about 13456.9868098323. The cubic root of 181090494 is about 565.7595381725.

The spelling of 181090494 in words is "one hundred eighty-one million, ninety thousand, four hundred ninety-four".