1818631 has 2 divisors, whose sum is σ = 1818632. Its totient is φ = 1818630.

The previous prime is 1818617. The next prime is 1818647. The reversal of 1818631 is 1368181.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (1368181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1818631 - 2¹¹ = 1816583 is a prime.

It is a super-2 number, since 2×1818631² = 6614837428322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1818631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1818611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 909315 + 909316.

It is an arithmetic number, because the mean of its divisors is an integer number (909316).

2^1818631 is an apocalyptic number.

1818631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1818631 is an equidigital number, since it uses as much as digits as its factorization.

1818631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 28.

The square root of 1818631 is about 1348.5662757165. The cubic root of 1818631 is about 122.0622946218.

The spelling of 1818631 in words is "one million, eight hundred eighteen thousand, six hundred thirty-one".