1818431 has 2 divisors, whose sum is σ = 1818432. Its totient is φ = 1818430.

The previous prime is 1818419. The next prime is 1818437. The reversal of 1818431 is 1348181.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1818431 is a prime.

It is a super-2 number, since 2×1818431² = 6613382603522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1818431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1818437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 909215 + 909216.

It is an arithmetic number, because the mean of its divisors is an integer number (909216).

2^1818431 is an apocalyptic number.

1818431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1818431 is an equidigital number, since it uses as much as digits as its factorization.

1818431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 768, while the sum is 26.

The square root of 1818431 is about 1348.4921208520. The cubic root of 1818431 is about 122.0578199457.

The spelling of 1818431 in words is "one million, eight hundred eighteen thousand, four hundred thirty-one".