1681287855 has 16 divisors (see below), whose sum is σ = 2896988640. Its totient is φ = 827710848.

The previous prime is 1681287809. The next prime is 1681287869. The reversal of 1681287855 is 5587821861.

It is not a de Polignac number, because 1681287855 - 2⁶ = 1681287791 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1681287798 and 1681287807.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4310800 + ... + 4311189.

It is an arithmetic number, because the mean of its divisors is an integer number (181061790).

Almost surely, 2^1681287855 is an apocalyptic number.

1681287855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1681287855 is a deficient number, since it is larger than the sum of its proper divisors (1215700785).

1681287855 is a wasteful number, since it uses less digits than its factorization.

1681287855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8622010.

The product of its digits is 1075200, while the sum is 51.

The square root of 1681287855 is about 41003.5102765605. The cubic root of 1681287855 is about 1189.0880792195.

The spelling of 1681287855 in words is "one billion, six hundred eighty-one million, two hundred eighty-seven thousand, eight hundred fifty-five".