2543109685 has 4 divisors (see below), whose sum is σ = 3051731628. Its totient is φ = 2034487744.

The previous prime is 2543109683. The next prime is 2543109719. The reversal of 2543109685 is 5869013452.

2543109685 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 546717924 + 1996391761 = 23382^2 + 44681^2 .

It is a cyclic number.

It is not a de Polignac number, because 2543109685 - 2¹ = 2543109683 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 (2543109683) 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, 254310964 + ... + 254310973.

It is an arithmetic number, because the mean of its divisors is an integer number (762932907).

Almost surely, 2^2543109685 is an apocalyptic number.

It is an amenable number.

2543109685 is a deficient number, since it is larger than the sum of its proper divisors (508621943).

2543109685 is an equidigital number, since it uses as much as digits as its factorization.

2543109685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508621942.

The product of its (nonzero) digits is 259200, while the sum is 43.

The square root of 2543109685 is about 50429.2542578214. The cubic root of 2543109685 is about 1364.9655713697.

The spelling of 2543109685 in words is "two billion, five hundred forty-three million, one hundred nine thousand, six hundred eighty-five".