18730631 has 2 divisors, whose sum is σ = 18730632. Its totient is φ = 18730630.

The previous prime is 18730627. The next prime is 18730633. The reversal of 18730631 is 13603781.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18730631 - 2² = 18730627 is a prime.

It is a super-2 number, since 2×18730631² = 701673075316322, which contains 22 as substring.

Together with 18730633, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18730594 and 18730603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18730633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9365315 + 9365316.

It is an arithmetic number, because the mean of its divisors is an integer number (9365316).

Almost surely, 2^18730631 is an apocalyptic number.

18730631 is a deficient number, since it is larger than the sum of its proper divisors (1).

18730631 is an equidigital number, since it uses as much as digits as its factorization.

18730631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 18730631 is about 4327.8899015571. The cubic root of 18730631 is about 265.5731324055.

The spelling of 18730631 in words is "eighteen million, seven hundred thirty thousand, six hundred thirty-one".