1813349187 has 40 divisors (see below), whose sum is σ = 3044077344. Its totient is φ = 1067375232.

The previous prime is 1813349077. The next prime is 1813349203. The reversal of 1813349187 is 7819433181.

1813349187 is a `hidden beast` number, since 1 + 81 + 3 + 3 + 491 + 87 = 666.

It is not a de Polignac number, because 1813349187 - 2¹⁵ = 1813316419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1813349287) 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 39 ways as a sum of consecutive naturals, for example, 13218 + ... + 61655.

Almost surely, 2^1813349187 is an apocalyptic number.

1813349187 is a deficient number, since it is larger than the sum of its proper divisors (1230728157).

1813349187 is a wasteful number, since it uses less digits than its factorization.

1813349187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74921 (or 74912 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 1813349187 is about 42583.4379424677. The cubic root of 1813349187 is about 1219.4401236017.

The spelling of 1813349187 in words is "one billion, eight hundred thirteen million, three hundred forty-nine thousand, one hundred eighty-seven".