18157019 has 2 divisors, whose sum is σ = 18157020. Its totient is φ = 18157018.

The previous prime is 18157001. The next prime is 18157031. The reversal of 18157019 is 91075181.

It is a strong prime.

It is an emirp because it is prime and its reverse (91075181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18157019 - 2⁸ = 18156763 is a prime.

It is a super-2 number, since 2×18157019² = 659354677932722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18157039) 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, 9078509 + 9078510.

It is an arithmetic number, because the mean of its divisors is an integer number (9078510).

Almost surely, 2^18157019 is an apocalyptic number.

18157019 is a deficient number, since it is larger than the sum of its proper divisors (1).

18157019 is an equidigital number, since it uses as much as digits as its factorization.

18157019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 32.

The square root of 18157019 is about 4261.1053730224. The cubic root of 18157019 is about 262.8339827494.

The spelling of 18157019 in words is "eighteen million, one hundred fifty-seven thousand, nineteen".