2391121 has 4 divisors (see below), whose sum is σ = 2394292. Its totient is φ = 2387952.

The previous prime is 2391119. The next prime is 2391127. The reversal of 2391121 is 1211932.

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 can be written as a sum of positive squares in 2 ways, for example, as 1718721 + 672400 = 1311^2 + 820^2 .

It is a cyclic number.

It is not a de Polignac number, because 2391121 - 2¹ = 2391119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2391127) 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, 271 + ... + 2203.

It is an arithmetic number, because the mean of its divisors is an integer number (598573).

2^2391121 is an apocalyptic number.

It is an amenable number.

2391121 is a deficient number, since it is larger than the sum of its proper divisors (3171).

2391121 is a wasteful number, since it uses less digits than its factorization.

2391121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3170.

The product of its digits is 108, while the sum is 19.

The square root of 2391121 is about 1546.3249981812. The cubic root of 2391121 is about 133.7212777874.

It can be divided in two parts, 23911 and 21, that added together give a palindrome (23932).

The spelling of 2391121 in words is "two million, three hundred ninety-one thousand, one hundred twenty-one".