18220057 has 2 divisors, whose sum is σ = 18220058. Its totient is φ = 18220056.

The previous prime is 18220051. The next prime is 18220087. The reversal of 18220057 is 75002281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16818201 + 1401856 = 4101^2 + 1184^2 .

It is a cyclic number.

It is not a de Polignac number, because 18220057 - 2³ = 18220049 is a prime.

It is not a weakly prime, because it can be changed into another prime (18220051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9110028 + 9110029.

It is an arithmetic number, because the mean of its divisors is an integer number (9110029).

Almost surely, 2^18220057 is an apocalyptic number.

It is an amenable number.

18220057 is a deficient number, since it is larger than the sum of its proper divisors (1).

18220057 is an equidigital number, since it uses as much as digits as its factorization.

18220057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 18220057 is about 4268.4958709128. The cubic root of 18220057 is about 263.1378026506.

The spelling of 18220057 in words is "eighteen million, two hundred twenty thousand, fifty-seven".