10011891 has 8 divisors (see below), whose sum is σ = 13363920. Its totient is φ = 6667232.

The previous prime is 10011871. The next prime is 10011901. The reversal of 10011891 is 19811001.

10011891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 10011891 - 2¹³ = 10003699 is a prime.

It is a super-2 number, since 2×10011891² = 200475922791762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (10011851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3805 + ... + 5873.

It is an arithmetic number, because the mean of its divisors is an integer number (1670490).

Almost surely, 2^10011891 is an apocalyptic number.

10011891 is a deficient number, since it is larger than the sum of its proper divisors (3352029).

10011891 is a wasteful number, since it uses less digits than its factorization.

10011891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3685.

The product of its (nonzero) digits is 72, while the sum is 21.

The square root of 10011891 is about 3164.1572337670. The cubic root of 10011891 is about 215.5288297876.

Adding to 10011891 its reverse (19811001), we get a palindrome (29822892).

The spelling of 10011891 in words is "ten million, eleven thousand, eight hundred ninety-one".