18513031 has 2 divisors, whose sum is σ = 18513032. Its totient is φ = 18513030.

The previous prime is 18513029. The next prime is 18513041. The reversal of 18513031 is 13031581.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18513031 - 2¹ = 18513029 is a prime.

It is a super-2 number, since 2×18513031² = 685464633613922, which contains 22 as substring.

Together with 18513029, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 18512993 and 18513011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18513041) 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 as a sum of consecutive naturals, namely, 9256515 + 9256516.

It is an arithmetic number, because the mean of its divisors is an integer number (9256516).

Almost surely, 2^18513031 is an apocalyptic number.

18513031 is a deficient number, since it is larger than the sum of its proper divisors (1).

18513031 is an equidigital number, since it uses as much as digits as its factorization.

18513031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 18513031 is about 4302.6771898436. The cubic root of 18513031 is about 264.5407067350.

The spelling of 18513031 in words is "eighteen million, five hundred thirteen thousand, thirty-one".