18222151 has 2 divisors, whose sum is σ = 18222152. Its totient is φ = 18222150.

The previous prime is 18222137. The next prime is 18222157. The reversal of 18222151 is 15122281.

It is a strong prime.

It is an emirp because it is prime and its reverse (15122281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18222151 - 2⁵ = 18222119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18222157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9111075 + 9111076.

It is an arithmetic number, because the mean of its divisors is an integer number (9111076).

Almost surely, 2^18222151 is an apocalyptic number.

18222151 is a deficient number, since it is larger than the sum of its proper divisors (1).

18222151 is an equidigital number, since it uses as much as digits as its factorization.

18222151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 320, while the sum is 22.

The square root of 18222151 is about 4268.7411493320. The cubic root of 18222151 is about 263.1478829237.

The spelling of 18222151 in words is "eighteen million, two hundred twenty-two thousand, one hundred fifty-one".