2540781813 has 8 divisors (see below), whose sum is σ = 3388156000. Its totient is φ = 1693631088.

The previous prime is 2540781791. The next prime is 2540781827. The reversal of 2540781813 is 3181870452.

2540781813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2540781813 - 2⁵ = 2540781781 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 (2540781833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27238 + ... + 76311.

It is an arithmetic number, because the mean of its divisors is an integer number (423519500).

Almost surely, 2^2540781813 is an apocalyptic number.

It is an amenable number.

2540781813 is a deficient number, since it is larger than the sum of its proper divisors (847374187).

2540781813 is a wasteful number, since it uses less digits than its factorization.

2540781813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111731.

The product of its (nonzero) digits is 53760, while the sum is 39.

The square root of 2540781813 is about 50406.1684022898. The cubic root of 2540781813 is about 1364.5489639436.

The spelling of 2540781813 in words is "two billion, five hundred forty million, seven hundred eighty-one thousand, eight hundred thirteen".