18157211 has 2 divisors, whose sum is σ = 18157212. Its totient is φ = 18157210.

The previous prime is 18157187. The next prime is 18157253. The reversal of 18157211 is 11275181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18157211 - 2⁶ = 18157147 is a prime.

It is a super-2 number, since 2×18157211² = 659368622597042, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18157291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9078605 + 9078606.

It is an arithmetic number, because the mean of its divisors is an integer number (9078606).

Almost surely, 2^18157211 is an apocalyptic number.

18157211 is a deficient number, since it is larger than the sum of its proper divisors (1).

18157211 is an equidigital number, since it uses as much as digits as its factorization.

18157211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 560, while the sum is 26.

The square root of 18157211 is about 4261.1279023282. The cubic root of 18157211 is about 262.8349091853.

The spelling of 18157211 in words is "eighteen million, one hundred fifty-seven thousand, two hundred eleven".