18187101 has 6 divisors (see below), whose sum is σ = 26270270. Its totient is φ = 12124728.

The previous prime is 18187063. The next prime is 18187121. The reversal of 18187101 is 10178181.

It can be written as a sum of positive squares in only one way, i.e., 16818201 + 1368900 = 4101^2 + 1170^2 .

It is not a de Polignac number, because 18187101 - 2¹⁵ = 18154333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18187121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1010386 + ... + 1010403.

Almost surely, 2^18187101 is an apocalyptic number.

It is an amenable number.

18187101 is a deficient number, since it is larger than the sum of its proper divisors (8083169).

18187101 is a wasteful number, since it uses less digits than its factorization.

18187101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2020795 (or 2020792 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 27.

The square root of 18187101 is about 4264.6337474630. The cubic root of 18187101 is about 262.9790544602.

The spelling of 18187101 in words is "eighteen million, one hundred eighty-seven thousand, one hundred one".