18160831 has 4 divisors (see below), whose sum is σ = 19557832. Its totient is φ = 16763832.

The previous prime is 18160801. The next prime is 18160837. The reversal of 18160831 is 13806181.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13806181 = 229 ⋅60289.

It is a cyclic number.

It is not a de Polignac number, because 18160831 - 2⁵ = 18160799 is a prime.

It is a super-2 number, since 2×18160831² = 659631565221122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18160831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18160837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 698481 + ... + 698506.

It is an arithmetic number, because the mean of its divisors is an integer number (4889458).

Almost surely, 2^18160831 is an apocalyptic number.

18160831 is a deficient number, since it is larger than the sum of its proper divisors (1397001).

18160831 is a wasteful number, since it uses less digits than its factorization.

18160831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1397000.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 18160831 is about 4261.5526513232. The cubic root of 18160831 is about 262.8523751414.

The spelling of 18160831 in words is "eighteen million, one hundred sixty thousand, eight hundred thirty-one".