181130865 has 16 divisors (see below), whose sum is σ = 302410368. Its totient is φ = 92402816.

The previous prime is 181130843. The next prime is 181130879. The reversal of 181130865 is 568031181.

It is a cyclic number.

It is not a de Polignac number, because 181130865 - 2⁹ = 181130353 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 262164 + ... + 262853.

It is an arithmetic number, because the mean of its divisors is an integer number (18900648).

Almost surely, 2^181130865 is an apocalyptic number.

181130865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

181130865 is a deficient number, since it is larger than the sum of its proper divisors (121279503).

181130865 is a wasteful number, since it uses less digits than its factorization.

181130865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525048.

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 181130865 is about 13458.4867277120. The cubic root of 181130865 is about 565.8015771567.

The spelling of 181130865 in words is "one hundred eighty-one million, one hundred thirty thousand, eight hundred sixty-five".