1001881 has 8 divisors (see below), whose sum is σ = 1033344. Its totient is φ = 971040.

The previous prime is 1001839. The next prime is 1001911. The reversal of 1001881 is 1881001.

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 1001881 - 2⁹ = 1001369 is a prime.

It is a super-2 number, since 2×1001881² = 2007531076322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7245 + ... + 7381.

It is an arithmetic number, because the mean of its divisors is an integer number (129168).

2^1001881 is an apocalyptic number.

It is an amenable number.

1001881 is a deficient number, since it is larger than the sum of its proper divisors (31463).

1001881 is a wasteful number, since it uses less digits than its factorization.

1001881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311.

The product of its (nonzero) digits is 64, while the sum is 19.

The square root of 1001881 is about 1000.9400581453. The cubic root of 1001881 is about 100.0626607281.

Adding to 1001881 its reverse (1881001), we get a palindrome (2882882).

The spelling of 1001881 in words is "one million, one thousand, eight hundred eighty-one".