8401891 has 4 divisors (see below), whose sum is σ = 8410672. Its totient is φ = 8393112.

The previous prime is 8401873. The next prime is 8401901. The reversal of 8401891 is 1981048.

8401891 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 8401891 - 2⁷ = 8401763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8401801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2751 + ... + 4936.

It is an arithmetic number, because the mean of its divisors is an integer number (2102668).

Almost surely, 2^8401891 is an apocalyptic number.

8401891 is a deficient number, since it is larger than the sum of its proper divisors (8781).

8401891 is a wasteful number, since it uses less digits than its factorization.

8401891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8780.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 8401891 is about 2898.6015593731. The cubic root of 8401891 is about 203.2945242304.

The spelling of 8401891 in words is "eight million, four hundred one thousand, eight hundred ninety-one".