1813149 has 12 divisors (see below), whose sum is σ = 2820636. Its totient is φ = 1115712.

The previous prime is 1813139. The next prime is 1813157. The reversal of 1813149 is 9413181.

It can be written as a sum of positive squares in 2 ways, for example, as 1102500 + 710649 = 1050^2 + 843^2 .

It is not a de Polignac number, because 1813149 - 2¹⁵ = 1780381 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7632 + ... + 7865.

It is an arithmetic number, because the mean of its divisors is an integer number (235053).

2^1813149 is an apocalyptic number.

It is an amenable number.

1813149 is a deficient number, since it is larger than the sum of its proper divisors (1007487).

1813149 is a wasteful number, since it uses less digits than its factorization.

1813149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15516 (or 15513 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 1813149 is about 1346.5322127599. The cubic root of 1813149 is about 121.9395248067.

The spelling of 1813149 in words is "one million, eight hundred thirteen thousand, one hundred forty-nine".