18441261 has 12 divisors (see below), whose sum is σ = 26874588. Its totient is φ = 12184704.

The previous prime is 18441259. The next prime is 18441271. The reversal of 18441261 is 16214481.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2996361 + 15444900 = 1731^2 + 3930^2 .

It is not a de Polignac number, because 18441261 - 2¹ = 18441259 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18441271) 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 in 11 ways as a sum of consecutive naturals, for example, 8050 + ... + 10083.

It is an arithmetic number, because the mean of its divisors is an integer number (2239549).

Almost surely, 2^18441261 is an apocalyptic number.

It is an amenable number.

18441261 is a deficient number, since it is larger than the sum of its proper divisors (8433327).

18441261 is a wasteful number, since it uses less digits than its factorization.

18441261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18252 (or 18249 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 18441261 is about 4294.3289347697. The cubic root of 18441261 is about 264.1984131701.

The spelling of 18441261 in words is "eighteen million, four hundred forty-one thousand, two hundred sixty-one".