8122891 has 4 divisors (see below), whose sum is σ = 9283312. Its totient is φ = 6962472.

The previous prime is 8122847. The next prime is 8122903. The reversal of 8122891 is 1982218.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8122891 - 2¹¹ = 8120843 is a prime.

It is a Duffinian number.

8122891 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (8122591) 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, 580200 + ... + 580213.

It is an arithmetic number, because the mean of its divisors is an integer number (2320828).

Almost surely, 2^8122891 is an apocalyptic number.

8122891 is a deficient number, since it is larger than the sum of its proper divisors (1160421).

8122891 is a wasteful number, since it uses less digits than its factorization.

8122891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1160420.

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

The square root of 8122891 is about 2850.0685956657. The cubic root of 8122891 is about 201.0188921460.

The spelling of 8122891 in words is "eight million, one hundred twenty-two thousand, eight hundred ninety-one".