2543750261 has 4 divisors (see below), whose sum is σ = 2739423372. Its totient is φ = 2348077152.

The previous prime is 2543750233. The next prime is 2543750263. The reversal of 2543750261 is 1620573452.

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 1053327025 + 1490423236 = 32455^2 + 38606^2 .

It is a cyclic number.

It is not a de Polignac number, because 2543750261 - 2⁶ = 2543750197 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 (2543750263) 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, 97836536 + ... + 97836561.

It is an arithmetic number, because the mean of its divisors is an integer number (684855843).

Almost surely, 2^2543750261 is an apocalyptic number.

It is an amenable number.

2543750261 is a deficient number, since it is larger than the sum of its proper divisors (195673111).

2543750261 is a wasteful number, since it uses less digits than its factorization.

2543750261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195673110.

The product of its (nonzero) digits is 50400, while the sum is 35.

The square root of 2543750261 is about 50435.6050920379. The cubic root of 2543750261 is about 1365.0801673947.

The spelling of 2543750261 in words is "two billion, five hundred forty-three million, seven hundred fifty thousand, two hundred sixty-one".