18091357 has 4 divisors (see below), whose sum is σ = 18113760. Its totient is φ = 18068956.

The previous prime is 18091313. The next prime is 18091369. The reversal of 18091357 is 75319081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18091357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18091457) 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 in 3 ways as a sum of consecutive naturals, for example, 9943 + ... + 11620.

It is an arithmetic number, because the mean of its divisors is an integer number (4528440).

Almost surely, 2^18091357 is an apocalyptic number.

It is an amenable number.

18091357 is a deficient number, since it is larger than the sum of its proper divisors (22403).

18091357 is an equidigital number, since it uses as much as digits as its factorization.

18091357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22402.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 18091357 is about 4253.3935863026. The cubic root of 18091357 is about 262.5167674852.

The spelling of 18091357 in words is "eighteen million, ninety-one thousand, three hundred fifty-seven".