1812228631 has 2 divisors, whose sum is σ = 1812228632. Its totient is φ = 1812228630.

The previous prime is 1812228623. The next prime is 1812228643. The reversal of 1812228631 is 1368222181.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1812228631 - 2³ = 1812228623 is a prime.

It is a super-2 number, since 2×1812228631² = 6568345222032268322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1812228031) 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 as a sum of consecutive naturals, namely, 906114315 + 906114316.

It is an arithmetic number, because the mean of its divisors is an integer number (906114316).

Almost surely, 2^1812228631 is an apocalyptic number.

1812228631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1812228631 is an equidigital number, since it uses as much as digits as its factorization.

1812228631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 34.

The square root of 1812228631 is about 42570.2787282395. The cubic root of 1812228631 is about 1219.1888882046.

The spelling of 1812228631 in words is "one billion, eight hundred twelve million, two hundred twenty-eight thousand, six hundred thirty-one".