18030121 has 2 divisors, whose sum is σ = 18030122. Its totient is φ = 18030120.

The previous prime is 18030113. The next prime is 18030143. The reversal of 18030121 is 12103081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11978521 + 6051600 = 3461^2 + 2460^2 .

It is a cyclic number.

It is not a de Polignac number, because 18030121 - 2³ = 18030113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18030095 and 18030104.

It is not a weakly prime, because it can be changed into another prime (18030101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9015060 + 9015061.

It is an arithmetic number, because the mean of its divisors is an integer number (9015061).

Almost surely, 2^18030121 is an apocalyptic number.

It is an amenable number.

18030121 is a deficient number, since it is larger than the sum of its proper divisors (1).

18030121 is an equidigital number, since it uses as much as digits as its factorization.

18030121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 18030121 is about 4246.1889972068. The cubic root of 18030121 is about 262.2202419400.

The spelling of 18030121 in words is "eighteen million, thirty thousand, one hundred twenty-one".