2501540861 has 4 divisors (see below), whose sum is σ = 2510380512. Its totient is φ = 2492701212.

The previous prime is 2501540849. The next prime is 2501540879. The reversal of 2501540861 is 1680451052.

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-2501540861 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 (2501440861) 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, 4419401 + ... + 4419966.

It is an arithmetic number, because the mean of its divisors is an integer number (627595128).

Almost surely, 2^2501540861 is an apocalyptic number.

It is an amenable number.

2501540861 is a deficient number, since it is larger than the sum of its proper divisors (8839651).

2501540861 is an equidigital number, since it uses as much as digits as its factorization.

2501540861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8839650.

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 2501540861 is about 50015.4062364788. The cubic root of 2501540861 is about 1357.4875870469.

The spelling of 2501540861 in words is "two billion, five hundred one million, five hundred forty thousand, eight hundred sixty-one".