2501506561 has 4 divisors (see below), whose sum is σ = 2548704852. Its totient is φ = 2454308272.

The previous prime is 2501506559. The next prime is 2501506643. The reversal of 2501506561 is 1656051052.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 741200625 + 1760305936 = 27225^2 + 41956^2 .

It is a cyclic number.

It is not a de Polignac number, because 2501506561 - 2¹ = 2501506559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2501506061) 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, 23599066 + ... + 23599171.

It is an arithmetic number, because the mean of its divisors is an integer number (637176213).

Almost surely, 2^2501506561 is an apocalyptic number.

It is an amenable number.

2501506561 is a deficient number, since it is larger than the sum of its proper divisors (47198291).

2501506561 is an equidigital number, since it uses as much as digits as its factorization.

2501506561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47198290.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 2501506561 is about 50015.0633409576. The cubic root of 2501506561 is about 1357.4813825994.

The spelling of 2501506561 in words is "two billion, five hundred one million, five hundred six thousand, five hundred sixty-one".