18237013 has 2 divisors, whose sum is σ = 18237014. Its totient is φ = 18237012.

The previous prime is 18237007. The next prime is 18237047. The reversal of 18237013 is 31073281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15421329 + 2815684 = 3927^2 + 1678^2 .

It is a cyclic number.

It is not a de Polignac number, because 18237013 - 2⁹ = 18236501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18237113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9118506 + 9118507.

It is an arithmetic number, because the mean of its divisors is an integer number (9118507).

Almost surely, 2^18237013 is an apocalyptic number.

It is an amenable number.

18237013 is a deficient number, since it is larger than the sum of its proper divisors (1).

18237013 is an equidigital number, since it uses as much as digits as its factorization.

18237013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 18237013 is about 4270.4815887672. The cubic root of 18237013 is about 263.2194046862.

It can be divided in two parts, 1823 and 7013, that added together give a square (8836 = 94²).

The spelling of 18237013 in words is "eighteen million, two hundred thirty-seven thousand, thirteen".