2505836521 has 4 divisors (see below), whose sum is σ = 2506003344. Its totient is φ = 2505669700.

The previous prime is 2505836519. The next prime is 2505836551. The reversal of 2505836521 is 1256385052.

It is a happy number.

2505836521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2505836521 - 2¹ = 2505836519 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2505836551) 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, 58375 + ... + 91756.

It is an arithmetic number, because the mean of its divisors is an integer number (626500836).

Almost surely, 2^2505836521 is an apocalyptic number.

It is an amenable number.

2505836521 is a deficient number, since it is larger than the sum of its proper divisors (166823).

2505836521 is a wasteful number, since it uses less digits than its factorization.

2505836521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166822.

The product of its (nonzero) digits is 72000, while the sum is 37.

The square root of 2505836521 is about 50058.3311847289. The cubic root of 2505836521 is about 1358.2641711315.

The spelling of 2505836521 in words is "two billion, five hundred five million, eight hundred thirty-six thousand, five hundred twenty-one".