2543440391 has 6 divisors (see below), whose sum is σ = 2598709800. Its totient is φ = 2489322476.

The previous prime is 2543440387. The next prime is 2543440423. The reversal of 2543440391 is 1930443452.

2543440391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2543440391 - 2² = 2543440387 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 (2543440591) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 573491 + ... + 577908.

It is an arithmetic number, because the mean of its divisors is an integer number (433118300).

Almost surely, 2^2543440391 is an apocalyptic number.

2543440391 is a deficient number, since it is larger than the sum of its proper divisors (55269409).

2543440391 is an equidigital number, since it uses as much as digits as its factorization.

2543440391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1151493 (or 1151446 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 2543440391 is about 50432.5330615070. The cubic root of 2543440391 is about 1365.0247355158.

The spelling of 2543440391 in words is "two billion, five hundred forty-three million, four hundred forty thousand, three hundred ninety-one".