2505530621 has 4 divisors (see below), whose sum is σ = 2733306144. Its totient is φ = 2277755100.

The previous prime is 2505530611. The next prime is 2505530647. The reversal of 2505530621 is 1260355052.

It is a happy number.

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 2505530621 - 2⁶ = 2505530557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2505530611) 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, 113887745 + ... + 113887766.

It is an arithmetic number, because the mean of its divisors is an integer number (683326536).

Almost surely, 2^2505530621 is an apocalyptic number.

It is an amenable number.

2505530621 is a deficient number, since it is larger than the sum of its proper divisors (227775523).

2505530621 is a wasteful number, since it uses less digits than its factorization.

2505530621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227775522.

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 2505530621 is about 50055.2756560185. The cubic root of 2505530621 is about 1358.2088988482.

Adding to 2505530621 its reverse (1260355052), we get a palindrome (3765885673).

The spelling of 2505530621 in words is "two billion, five hundred five million, five hundred thirty thousand, six hundred twenty-one".