18234631 has 2 divisors, whose sum is σ = 18234632. Its totient is φ = 18234630.

The previous prime is 18234613. The next prime is 18234691. The reversal of 18234631 is 13643281.

Together with previous prime (18234613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18234631 is a prime.

It is a super-2 number, since 2×18234631² = 665003535412322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18234631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18234611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9117315 + 9117316.

It is an arithmetic number, because the mean of its divisors is an integer number (9117316).

Almost surely, 2^18234631 is an apocalyptic number.

18234631 is a deficient number, since it is larger than the sum of its proper divisors (1).

18234631 is an equidigital number, since it uses as much as digits as its factorization.

18234631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 28.

The square root of 18234631 is about 4270.2026883978. The cubic root of 18234631 is about 263.2079441852.

The spelling of 18234631 in words is "eighteen million, two hundred thirty-four thousand, six hundred thirty-one".