1681812203 has 2 divisors, whose sum is σ = 1681812204. Its totient is φ = 1681812202.

The previous prime is 1681812199. The next prime is 1681812211. The reversal of 1681812203 is 3022181861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1681812203 - 2² = 1681812199 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1681812203.

It is not a weakly prime, because it can be changed into another prime (1681811203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840906101 + 840906102.

It is an arithmetic number, because the mean of its divisors is an integer number (840906102).

Almost surely, 2^1681812203 is an apocalyptic number.

1681812203 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681812203 is an equidigital number, since it uses as much as digits as its factorization.

1681812203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 1681812203 is about 41009.9037184922. The cubic root of 1681812203 is about 1189.2116811255.

The spelling of 1681812203 in words is "one billion, six hundred eighty-one million, eight hundred twelve thousand, two hundred three".