18159031 has 8 divisors (see below), whose sum is σ = 20089728. Its totient is φ = 16275000.

The previous prime is 18159007. The next prime is 18159049. The reversal of 18159031 is 13095181.

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 18159031 - 2⁵ = 18158999 is a prime.

It is a super-2 number, since 2×18159031² = 659500813717922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18159131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10845 + ... + 12406.

It is an arithmetic number, because the mean of its divisors is an integer number (2511216).

Almost surely, 2^18159031 is an apocalyptic number.

18159031 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18159031 is a deficient number, since it is larger than the sum of its proper divisors (1930697).

18159031 is a wasteful number, since it uses less digits than its factorization.

18159031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23333.

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 18159031 is about 4261.3414554574. The cubic root of 18159031 is about 262.8436907020.

The spelling of 18159031 in words is "eighteen million, one hundred fifty-nine thousand, thirty-one".