18252109 has 2 divisors, whose sum is σ = 18252110. Its totient is φ = 18252108.

The previous prime is 18252083. The next prime is 18252131. The reversal of 18252109 is 90125281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11764900 + 6487209 = 3430^2 + 2547^2 .

It is a cyclic number.

It is not a de Polignac number, because 18252109 - 2¹³ = 18243917 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18252139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9126054 + 9126055.

It is an arithmetic number, because the mean of its divisors is an integer number (9126055).

Almost surely, 2^18252109 is an apocalyptic number.

It is an amenable number.

18252109 is a deficient number, since it is larger than the sum of its proper divisors (1).

18252109 is an equidigital number, since it uses as much as digits as its factorization.

18252109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 18252109 is about 4272.2487053073. The cubic root of 18252109 is about 263.2920127799.

It can be divided in two parts, 1825 and 2109, that multiplied together give a triangular number (3848925 = T₂₇₇₄).

The spelling of 18252109 in words is "eighteen million, two hundred fifty-two thousand, one hundred nine".