1816131 has 12 divisors (see below), whose sum is σ = 2477832. Its totient is φ = 1183104.

The previous prime is 1816121. The next prime is 1816141. The reversal of 1816131 is 1316181.

It is an interprime number because it is at equal distance from previous prime (1816121) and next prime (1816141).

It is not a de Polignac number, because 1816131 - 2⁵ = 1816099 is a prime.

It is a super-2 number, since 2×1816131² = 6596663618322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1816098 and 1816107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1816121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18675 + ... + 18771.

It is an arithmetic number, because the mean of its divisors is an integer number (206486).

2^1816131 is an apocalyptic number.

1816131 is a deficient number, since it is larger than the sum of its proper divisors (661701).

1816131 is an frugal number, since it uses more digits than its factorization.

1816131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258 (or 179 counting only the distinct ones).

The product of its digits is 144, while the sum is 21.

The square root of 1816131 is about 1347.6390466293. The cubic root of 1816131 is about 122.0063375728.

The spelling of 1816131 in words is "one million, eight hundred sixteen thousand, one hundred thirty-one".