1681203405 has 16 divisors (see below), whose sum is σ = 3074200704. Its totient is φ = 768550080.

The previous prime is 1681203397. The next prime is 1681203413. The reversal of 1681203405 is 5043021861.

It is an interprime number because it is at equal distance from previous prime (1681203397) and next prime (1681203413).

It is not a de Polignac number, because 1681203405 - 2³ = 1681203397 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 8005626 + ... + 8005835.

It is an arithmetic number, because the mean of its divisors is an integer number (192137544).

Almost surely, 2^1681203405 is an apocalyptic number.

1681203405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1681203405 is a deficient number, since it is larger than the sum of its proper divisors (1392997299).

1681203405 is a wasteful number, since it uses less digits than its factorization.

1681203405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16011476.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 1681203405 is about 41002.4804737470. The cubic root of 1681203405 is about 1189.0681698448.

The spelling of 1681203405 in words is "one billion, six hundred eighty-one million, two hundred three thousand, four hundred five".