2501621 has 4 divisors (see below), whose sum is σ = 2507712. Its totient is φ = 2495532.

The previous prime is 2501599. The next prime is 2501623. The reversal of 2501621 is 1261052.

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 a de Polignac number, because none of the positive numbers 2^k-2501621 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 2501621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2501623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2381 + ... + 3266.

It is an arithmetic number, because the mean of its divisors is an integer number (626928).

2^2501621 is an apocalyptic number.

It is an amenable number.

2501621 is a deficient number, since it is larger than the sum of its proper divisors (6091).

2501621 is an equidigital number, since it uses as much as digits as its factorization.

2501621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6090.

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

The square root of 2501621 is about 1581.6513522265. The cubic root of 2501621 is about 135.7502082984.

Adding to 2501621 its reverse (1261052), we get a palindrome (3762673).

The spelling of 2501621 in words is "two million, five hundred one thousand, six hundred twenty-one".