2543749997 has 4 divisors (see below), whose sum is σ = 2548040220. Its totient is φ = 2539459776.

The previous prime is 2543749991. The next prime is 2543750017. The reversal of 2543749997 is 7999473452.

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 1627234921 + 916515076 = 40339^2 + 30274^2 .

It is a cyclic number.

It is not a de Polignac number, because 2543749997 - 2¹² = 2543745901 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 (2543749991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2144222 + ... + 2145407.

It is an arithmetic number, because the mean of its divisors is an integer number (637010055).

Almost surely, 2^2543749997 is an apocalyptic number.

It is an amenable number.

2543749997 is a deficient number, since it is larger than the sum of its proper divisors (4290223).

2543749997 is an equidigital number, since it uses as much as digits as its factorization.

2543749997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4290222.

The product of its digits is 17146080, while the sum is 59.

The square root of 2543749997 is about 50435.6024748391. The cubic root of 2543749997 is about 1365.0801201703.

The spelling of 2543749997 in words is "two billion, five hundred forty-three million, seven hundred forty-nine thousand, nine hundred ninety-seven".