18552109 has 2 divisors, whose sum is σ = 18552110. Its totient is φ = 18552108.

The previous prime is 18552103. The next prime is 18552143. The reversal of 18552109 is 90125581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16024009 + 2528100 = 4003^2 + 1590^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18552109 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 (18552103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9276054 + 9276055.

It is an arithmetic number, because the mean of its divisors is an integer number (9276055).

Almost surely, 2^18552109 is an apocalyptic number.

It is an amenable number.

18552109 is a deficient number, since it is larger than the sum of its proper divisors (1).

18552109 is an equidigital number, since it uses as much as digits as its factorization.

18552109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 18552109 is about 4307.2159221474. The cubic root of 18552109 is about 264.7267100697.

The spelling of 18552109 in words is "eighteen million, five hundred fifty-two thousand, one hundred nine".