18160991 has 8 divisors (see below), whose sum is σ = 18664800. Its totient is φ = 17660160.

The previous prime is 18160973. The next prime is 18160993. The reversal of 18160991 is 19906181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18160991 - 2¹⁸ = 17898847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18160993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17495 + ... + 18503.

It is an arithmetic number, because the mean of its divisors is an integer number (2333100).

Almost surely, 2^18160991 is an apocalyptic number.

18160991 is a deficient number, since it is larger than the sum of its proper divisors (503809).

18160991 is a wasteful number, since it uses less digits than its factorization.

18160991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1489.

The product of its (nonzero) digits is 3888, while the sum is 35.

The square root of 18160991 is about 4261.5714237825. The cubic root of 18160991 is about 262.8531470638.

The spelling of 18160991 in words is "eighteen million, one hundred sixty thousand, nine hundred ninety-one".