2290891 has 4 divisors (see below), whose sum is σ = 2293984. Its totient is φ = 2287800.

The previous prime is 2290889. The next prime is 2290901. The reversal of 2290891 is 1980922.

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 2290891 - 2¹ = 2290889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2290831) 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, 301 + ... + 2161.

It is an arithmetic number, because the mean of its divisors is an integer number (573496).

2^2290891 is an apocalyptic number.

2290891 is a deficient number, since it is larger than the sum of its proper divisors (3093).

2290891 is a wasteful number, since it uses less digits than its factorization.

2290891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3092.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 2290891 is about 1513.5689610982. The cubic root of 2290891 is about 131.8261216851.

Adding to 2290891 its sum of digits (31), we get a palindrome (2290922).

The spelling of 2290891 in words is "two million, two hundred ninety thousand, eight hundred ninety-one".