18220159 has 2 divisors, whose sum is σ = 18220160. Its totient is φ = 18220158.

The previous prime is 18220127. The next prime is 18220171. The reversal of 18220159 is 95102281.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18220159 - 2⁵ = 18220127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18220109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9110079 + 9110080.

It is an arithmetic number, because the mean of its divisors is an integer number (9110080).

Almost surely, 2^18220159 is an apocalyptic number.

18220159 is a deficient number, since it is larger than the sum of its proper divisors (1).

18220159 is an equidigital number, since it uses as much as digits as its factorization.

18220159 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 18220159 is about 4268.5078188988. The cubic root of 18220159 is about 263.1382936846.

The spelling of 18220159 in words is "eighteen million, two hundred twenty thousand, one hundred fifty-nine".