18100849 has 4 divisors (see below), whose sum is σ = 19493236. Its totient is φ = 16708464.

The previous prime is 18100837. The next prime is 18100853. The reversal of 18100849 is 94800181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8020224 + 10080625 = 2832^2 + 3175^2 .

It is a cyclic number.

It is not a de Polignac number, because 18100849 - 2⁹ = 18100337 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18100849.

It is not an unprimeable number, because it can be changed into a prime (18106849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 696174 + ... + 696199.

It is an arithmetic number, because the mean of its divisors is an integer number (4873309).

Almost surely, 2^18100849 is an apocalyptic number.

It is an amenable number.

18100849 is a deficient number, since it is larger than the sum of its proper divisors (1392387).

18100849 is a wasteful number, since it uses less digits than its factorization.

18100849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1392386.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 18100849 is about 4254.5092548965. The cubic root of 18100849 is about 262.5626710529.

The spelling of 18100849 in words is "eighteen million, one hundred thousand, eight hundred forty-nine".