18310121 has 2 divisors, whose sum is σ = 18310122. Its totient is φ = 18310120.

The previous prime is 18310111. The next prime is 18310151. The reversal of 18310121 is 12101381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17732521 + 577600 = 4211^2 + 760^2 .

It is a cyclic number.

It is not a de Polignac number, because 18310121 - 2¹⁰ = 18309097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18310121.

It is not a weakly prime, because it can be changed into another prime (18310111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9155060 + 9155061.

It is an arithmetic number, because the mean of its divisors is an integer number (9155061).

Almost surely, 2^18310121 is an apocalyptic number.

It is an amenable number.

18310121 is a deficient number, since it is larger than the sum of its proper divisors (1).

18310121 is an equidigital number, since it uses as much as digits as its factorization.

18310121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 17.

The square root of 18310121 is about 4279.0327177997. The cubic root of 18310121 is about 263.5706644598.

The spelling of 18310121 in words is "eighteen million, three hundred ten thousand, one hundred twenty-one".