1809409149 has 48 divisors (see below), whose sum is σ = 2803507200. Its totient is φ = 1121887008.

The previous prime is 1809409139. The next prime is 1809409157. The reversal of 1809409149 is 9419049081.

It is not a de Polignac number, because 1809409149 - 2⁵ = 1809409117 is a prime.

It is a super-2 number, since 2×1809409149² = 6547922936969808402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1809409139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1740972 + ... + 1742010.

It is an arithmetic number, because the mean of its divisors is an integer number (58406400).

Almost surely, 2^1809409149 is an apocalyptic number.

It is an amenable number.

1809409149 is a deficient number, since it is larger than the sum of its proper divisors (994098051).

1809409149 is a wasteful number, since it uses less digits than its factorization.

1809409149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1294 (or 1291 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 1809409149 is about 42537.1502218943. The cubic root of 1809409149 is about 1218.5562849195.

The spelling of 1809409149 in words is "one billion, eight hundred nine million, four hundred nine thousand, one hundred forty-nine".