2291897 has 4 divisors (see below), whose sum is σ = 2295540. Its totient is φ = 2288256.

The previous prime is 2291893. The next prime is 2291903. The reversal of 2291897 is 7981922.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1510441 + 781456 = 1229^2 + 884^2 .

It is a cyclic number.

It is not a de Polignac number, because 2291897 - 2² = 2291893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2291897.

It is not an unprimeable number, because it can be changed into a prime (2291893) 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, 608 + ... + 2225.

It is an arithmetic number, because the mean of its divisors is an integer number (573885).

2^2291897 is an apocalyptic number.

It is an amenable number.

2291897 is a deficient number, since it is larger than the sum of its proper divisors (3643).

2291897 is an equidigital number, since it uses as much as digits as its factorization.

2291897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3642.

The product of its digits is 18144, while the sum is 38.

The square root of 2291897 is about 1513.9012517334. The cubic root of 2291897 is about 131.8454151494.

It can be divided in two parts, 22 and 91897, that added together give a palindrome (91919).

The spelling of 2291897 in words is "two million, two hundred ninety-one thousand, eight hundred ninety-seven".