2523921 has 4 divisors (see below), whose sum is σ = 3365232. Its totient is φ = 1682612.

The previous prime is 2523907. The next prime is 2523923. The reversal of 2523921 is 1293252.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2523921 - 2¹⁷ = 2392849 is a prime.

It is a D-number.

It is a Curzon number.

2523921 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2523891 and 2523900.

It is not an unprimeable number, because it can be changed into a prime (2523923) 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, 420651 + ... + 420656.

It is an arithmetic number, because the mean of its divisors is an integer number (841308).

2^2523921 is an apocalyptic number.

It is an amenable number.

2523921 is a deficient number, since it is larger than the sum of its proper divisors (841311).

2523921 is an equidigital number, since it uses as much as digits as its factorization.

2523921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841310.

The product of its digits is 1080, while the sum is 24.

The square root of 2523921 is about 1588.6853055278. The cubic root of 2523921 is about 136.1523847004.

The spelling of 2523921 in words is "two million, five hundred twenty-three thousand, nine hundred twenty-one".