1813169 has 4 divisors (see below), whose sum is σ = 1919844. Its totient is φ = 1706496.

The previous prime is 1813157. The next prime is 1813177. The reversal of 1813169 is 9613181.

It is a happy number.

1813169 is nontrivially palindromic in base 5 and base 16.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9613181 = 29 ⋅331489.

It can be written as a sum of positive squares in 2 ways, for example, as 1575025 + 238144 = 1255^2 + 488^2 .

It is a cyclic number.

It is not a de Polignac number, because 1813169 - 2¹⁶ = 1747633 is a prime.

It is a super-2 number, since 2×1813169² = 6575163645122, which contains 22 as substring.

It is a Curzon 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 3 ways as a sum of consecutive naturals, for example, 53312 + ... + 53345.

It is an arithmetic number, because the mean of its divisors is an integer number (479961).

2^1813169 is an apocalyptic number.

It is an amenable number.

1813169 is a deficient number, since it is larger than the sum of its proper divisors (106675).

1813169 is a wasteful number, since it uses less digits than its factorization.

1813169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106674.

The product of its digits is 1296, while the sum is 29.

The square root of 1813169 is about 1346.5396392234. The cubic root of 1813169 is about 121.9399731577.

The spelling of 1813169 in words is "one million, eight hundred thirteen thousand, one hundred sixty-nine".