2409521 has 4 divisors (see below), whose sum is σ = 2445552. Its totient is φ = 2373492.

The previous prime is 2409509. The next prime is 2409541. The reversal of 2409521 is 1259042.

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 2409521 - 2¹⁴ = 2393137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2409541) 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, 17915 + ... + 18048.

It is an arithmetic number, because the mean of its divisors is an integer number (611388).

2^2409521 is an apocalyptic number.

It is an amenable number.

2409521 is a deficient number, since it is larger than the sum of its proper divisors (36031).

2409521 is an equidigital number, since it uses as much as digits as its factorization.

2409521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36030.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 2409521 is about 1552.2631864475. The cubic root of 2409521 is about 134.0634028317.

The spelling of 2409521 in words is "two million, four hundred nine thousand, five hundred twenty-one".