2521601 has 8 divisors (see below), whose sum is σ = 2601600. Its totient is φ = 2442960.

The previous prime is 2521591. The next prime is 2521609. The reversal of 2521601 is 1061252.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2521601 - 2⁶ = 2521537 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 2521601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2521609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4391 + ... + 4931.

It is an arithmetic number, because the mean of its divisors is an integer number (325200).

2^2521601 is an apocalyptic number.

It is an amenable number.

2521601 is a deficient number, since it is larger than the sum of its proper divisors (79999).

2521601 is an equidigital number, since it uses as much as digits as its factorization.

2521601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 2521601 is about 1587.9549741728. The cubic root of 2521601 is about 136.1106546084.

Adding to 2521601 its reverse (1061252), we get a palindrome (3582853).

The spelling of 2521601 in words is "two million, five hundred twenty-one thousand, six hundred one".