18132631 has 16 divisors (see below), whose sum is σ = 21052800. Its totient is φ = 15444000.

The previous prime is 18132629. The next prime is 18132637. The reversal of 18132631 is 13623181.

It is not a de Polignac number, because 18132631 - 2¹ = 18132629 is a prime.

It is a super-2 number, since 2×18132631² = 657584613964322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18132596 and 18132605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18132637) 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 15 ways as a sum of consecutive naturals, for example, 20680 + ... + 21538.

It is an arithmetic number, because the mean of its divisors is an integer number (1315800).

Almost surely, 2^18132631 is an apocalyptic number.

18132631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18132631 is a deficient number, since it is larger than the sum of its proper divisors (2920169).

18132631 is a wasteful number, since it uses less digits than its factorization.

18132631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990.

The product of its digits is 864, while the sum is 25.

The square root of 18132631 is about 4258.2427126692. The cubic root of 18132631 is about 262.7162529388.

It can be divided in two parts, 1813 and 2631, that added together give a palindrome (4444).

The spelling of 18132631 in words is "eighteen million, one hundred thirty-two thousand, six hundred thirty-one".