1681004381 has 16 divisors (see below), whose sum is σ = 2007742464. Its totient is φ = 1376106864.

The previous prime is 1681004333. The next prime is 1681004383. The reversal of 1681004381 is 1834001861.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1681004381 - 2⁶ = 1681004317 is a prime.

It is a super-2 number, since 2×1681004381² = 5651551457882386322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681004383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102320 + ... + 117606.

It is an arithmetic number, because the mean of its divisors is an integer number (125483904).

Almost surely, 2^1681004381 is an apocalyptic number.

It is an amenable number.

1681004381 is a deficient number, since it is larger than the sum of its proper divisors (326738083).

1681004381 is a wasteful number, since it uses less digits than its factorization.

1681004381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16000.

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

The square root of 1681004381 is about 41000.0534267945. The cubic root of 1681004381 is about 1189.0212466226.

The spelling of 1681004381 in words is "one billion, six hundred eighty-one million, four thousand, three hundred eighty-one".