18534631 has 2 divisors, whose sum is σ = 18534632. Its totient is φ = 18534630.

The previous prime is 18534629. The next prime is 18534697. The reversal of 18534631 is 13643581.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18534631 - 2¹ = 18534629 is a prime.

It is a super-2 number, since 2×18534631² = 687065092612322, which contains 22 as substring.

Together with 18534629, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 18534593 and 18534602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18534031) 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, 9267315 + 9267316.

It is an arithmetic number, because the mean of its divisors is an integer number (9267316).

Almost surely, 2^18534631 is an apocalyptic number.

18534631 is a deficient number, since it is larger than the sum of its proper divisors (1).

18534631 is an equidigital number, since it uses as much as digits as its factorization.

18534631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 31.

The square root of 18534631 is about 4305.1865232531. The cubic root of 18534631 is about 264.6435506618.

The spelling of 18534631 in words is "eighteen million, five hundred thirty-four thousand, six hundred thirty-one".