1812861043 has 8 divisors (see below), whose sum is σ = 2122374240. Its totient is φ = 1515981120.

The previous prime is 1812861031. The next prime is 1812861053. The reversal of 1812861043 is 3401682181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1812861043 is a prime.

It is a super-2 number, since 2×1812861043² = 6572930322454095698, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1812861053) 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 7 ways as a sum of consecutive naturals, for example, 3158008 + ... + 3158581.

It is an arithmetic number, because the mean of its divisors is an integer number (265296780).

Almost surely, 2^1812861043 is an apocalyptic number.

1812861043 is a deficient number, since it is larger than the sum of its proper divisors (309513197).

1812861043 is an equidigital number, since it uses as much as digits as its factorization.

1812861043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6316637.

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

The square root of 1812861043 is about 42577.7059386717. The cubic root of 1812861043 is about 1219.3306915067.

It can be divided in two parts, 181286 and 1043, that added together give a square (182329 = 427²).

The spelling of 1812861043 in words is "one billion, eight hundred twelve million, eight hundred sixty-one thousand, forty-three".