1818131 has 4 divisors (see below), whose sum is σ = 2077872. Its totient is φ = 1558392.

The previous prime is 1818109. The next prime is 1818151. The reversal of 1818131 is 1318181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1318181 = 163 ⋅8087.

It is a cyclic number.

It is not a de Polignac number, because 1818131 - 2⁶ = 1818067 is a prime.

It is a super-2 number, since 2×1818131² = 6611200666322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1818097 and 1818106.

It is not an unprimeable number, because it can be changed into a prime (1818151) 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 3 ways as a sum of consecutive naturals, for example, 129860 + ... + 129873.

It is an arithmetic number, because the mean of its divisors is an integer number (519468).

2^1818131 is an apocalyptic number.

1818131 is a deficient number, since it is larger than the sum of its proper divisors (259741).

1818131 is an equidigital number, since it uses as much as digits as its factorization.

1818131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259740.

The product of its digits is 192, while the sum is 23.

The square root of 1818131 is about 1348.3808809087. The cubic root of 1818131 is about 122.0511073164.

The spelling of 1818131 in words is "one million, eight hundred eighteen thousand, one hundred thirty-one".