10001881 has 2 divisors, whose sum is σ = 10001882. Its totient is φ = 10001880.

The previous prime is 10001861. The next prime is 10001891. The reversal of 10001881 is 18810001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8880400 + 1121481 = 2980^2 + 1059^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10001881 is a prime.

It is a super-2 number, since 2×10001881² = 200075247076322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (10001801) 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 as a sum of consecutive naturals, namely, 5000940 + 5000941.

It is an arithmetic number, because the mean of its divisors is an integer number (5000941).

Almost surely, 2^10001881 is an apocalyptic number.

It is an amenable number.

10001881 is a deficient number, since it is larger than the sum of its proper divisors (1).

10001881 is an equidigital number, since it uses as much as digits as its factorization.

10001881 is an odious number, because the sum of its binary digits is odd.

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

The square root of 10001881 is about 3162.5750583978. The cubic root of 10001881 is about 215.4569764618.

Adding to 10001881 its reverse (18810001), we get a palindrome (28811882).

The spelling of 10001881 in words is "ten million, one thousand, eight hundred eighty-one".