1681603812 has 36 divisors (see below), whose sum is σ = 4857967296. Its totient is φ = 480458160.

The previous prime is 1681603811. The next prime is 1681603813. The reversal of 1681603812 is 2183061861.

It is an interprime number because it is at equal distance from previous prime (1681603811) and next prime (1681603813).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1681603811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3336264 + ... + 3336767.

It is an arithmetic number, because the mean of its divisors is an integer number (134943536).

Almost surely, 2^1681603812 is an apocalyptic number.

1681603812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1681603812 is an abundant number, since it is smaller than the sum of its proper divisors (3176363484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1681603812 is a wasteful number, since it uses less digits than its factorization.

1681603812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6673048 (or 6673043 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 1681603812 is about 41007.3628998501. The cubic root of 1681603812 is about 1189.1625612441.

The spelling of 1681603812 in words is "one billion, six hundred eighty-one million, six hundred three thousand, eight hundred twelve".