1681001881 has 8 divisors (see below), whose sum is σ = 1852410560. Its totient is φ = 1515607632.

The previous prime is 1681001873. The next prime is 1681001909. The reversal of 1681001881 is 1881001861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1681001881 - 2³ = 1681001873 is a prime.

It is a super-2 number, since 2×1681001881² = 5651534647851076322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1681001831) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1503021 + ... + 1504138.

It is an arithmetic number, because the mean of its divisors is an integer number (231551320).

Almost surely, 2^1681001881 is an apocalyptic number.

It is an amenable number.

1681001881 is a deficient number, since it is larger than the sum of its proper divisors (171408679).

1681001881 is a wasteful number, since it uses less digits than its factorization.

1681001881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3007215.

The product of its (nonzero) digits is 3072, while the sum is 34.

The square root of 1681001881 is about 41000.0229390180. The cubic root of 1681001881 is about 1189.0206571824.

The spelling of 1681001881 in words is "one billion, six hundred eighty-one million, one thousand, eight hundred eighty-one".