18130591 has 2 divisors, whose sum is σ = 18130592. Its totient is φ = 18130590.

The previous prime is 18130583. The next prime is 18130621. The reversal of 18130591 is 19503181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18130591 - 2³ = 18130583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18130291) 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, 9065295 + 9065296.

It is an arithmetic number, because the mean of its divisors is an integer number (9065296).

Almost surely, 2^18130591 is an apocalyptic number.

18130591 is a deficient number, since it is larger than the sum of its proper divisors (1).

18130591 is an equidigital number, since it uses as much as digits as its factorization.

18130591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 18130591 is about 4258.0031705014. The cubic root of 18130591 is about 262.7064003282.

It can be divided in two parts, 18130 and 591, that added together give a triangular number (18721 = T₁₉₃).

The spelling of 18130591 in words is "eighteen million, one hundred thirty thousand, five hundred ninety-one".