1681447603 has 4 divisors (see below), whose sum is σ = 1834306488. Its totient is φ = 1528588720.

The previous prime is 1681447589. The next prime is 1681447633. The reversal of 1681447603 is 3067441861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1681447603 - 2¹⁷ = 1681316531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1681447633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76429426 + ... + 76429447.

It is an arithmetic number, because the mean of its divisors is an integer number (458576622).

Almost surely, 2^1681447603 is an apocalyptic number.

1681447603 is a deficient number, since it is larger than the sum of its proper divisors (152858885).

1681447603 is a wasteful number, since it uses less digits than its factorization.

1681447603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152858884.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 1681447603 is about 41005.4582098530. The cubic root of 1681447603 is about 1189.1257385305.

The spelling of 1681447603 in words is "one billion, six hundred eighty-one million, four hundred forty-seven thousand, six hundred three".