18080631 has 16 divisors (see below), whose sum is σ = 27441120. Its totient is φ = 11759040.

The previous prime is 18080627. The next prime is 18080641. The reversal of 18080631 is 13608081.

It is not a de Polignac number, because 18080631 - 2² = 18080627 is a prime.

It is a super-2 number, since 2×18080631² = 653818434716322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 18080595 and 18080604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18080641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7060 + ... + 9273.

It is an arithmetic number, because the mean of its divisors is an integer number (1715070).

Almost surely, 2^18080631 is an apocalyptic number.

18080631 is a deficient number, since it is larger than the sum of its proper divisors (9360489).

18080631 is a wasteful number, since it uses less digits than its factorization.

18080631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16383 (or 16377 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 18080631 is about 4252.1325238050. The cubic root of 18080631 is about 262.4648769333.

The spelling of 18080631 in words is "eighteen million, eighty thousand, six hundred thirty-one".