1813131 has 8 divisors (see below), whose sum is σ = 2686160. Its totient is φ = 1208736.

The previous prime is 1813121. The next prime is 1813139. The reversal of 1813131 is 1313181.

It is a happy number.

It is not a de Polignac number, because 1813131 - 2⁷ = 1813003 is a prime.

It is a super-2 number, since 2×1813131² = 6574888046322, which contains 22 as substring.

It is a Duffinian number.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33550 + ... + 33603.

It is an arithmetic number, because the mean of its divisors is an integer number (335770).

2^1813131 is an apocalyptic number.

1813131 is a deficient number, since it is larger than the sum of its proper divisors (873029).

1813131 is an equidigital number, since it uses as much as digits as its factorization.

1813131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67162 (or 67156 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

The square root of 1813131 is about 1346.5255289076. The cubic root of 1813131 is about 121.9391212880.

The spelling of 1813131 in words is "one million, eight hundred thirteen thousand, one hundred thirty-one".