18222157 has 2 divisors, whose sum is σ = 18222158. Its totient is φ = 18222156.

The previous prime is 18222151. The next prime is 18222161. The reversal of 18222157 is 75122281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11519236 + 6702921 = 3394^2 + 2589^2 .

It is a cyclic number.

It is not a de Polignac number, because 18222157 - 2¹¹ = 18220109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18222151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9111078 + 9111079.

It is an arithmetic number, because the mean of its divisors is an integer number (9111079).

Almost surely, 2^18222157 is an apocalyptic number.

It is an amenable number.

18222157 is a deficient number, since it is larger than the sum of its proper divisors (1).

18222157 is an equidigital number, since it uses as much as digits as its factorization.

18222157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2240, while the sum is 28.

The square root of 18222157 is about 4268.7418521152. The cubic root of 18222157 is about 263.1479118059.

The spelling of 18222157 in words is "eighteen million, two hundred twenty-two thousand, one hundred fifty-seven".