2331521 has 4 divisors (see below), whose sum is σ = 2345172. Its totient is φ = 2317872.

The previous prime is 2331463. The next prime is 2331557. The reversal of 2331521 is 1251332.

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 1890625 + 440896 = 1375^2 + 664^2 .

It is a cyclic number.

It is not a de Polignac number, because 2331521 - 2¹⁸ = 2069377 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 2331521.

It is not an unprimeable number, because it can be changed into a prime (2331421) 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, 6566 + ... + 6911.

It is an arithmetic number, because the mean of its divisors is an integer number (586293).

2^2331521 is an apocalyptic number.

It is an amenable number.

2331521 is a deficient number, since it is larger than the sum of its proper divisors (13651).

2331521 is a wasteful number, since it uses less digits than its factorization.

2331521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13650.

The product of its digits is 180, while the sum is 17.

The square root of 2331521 is about 1526.9318910809. The cubic root of 2331521 is about 132.6008914733.

Adding to 2331521 its reverse (1251332), we get a palindrome (3582853).

The spelling of 2331521 in words is "two million, three hundred thirty-one thousand, five hundred twenty-one".