2643869213 has 4 divisors (see below), whose sum is σ = 2659151868. Its totient is φ = 2628586560.

The previous prime is 2643869203. The next prime is 2643869243. The reversal of 2643869213 is 3129683462.

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 1058396089 + 1585473124 = 32533^2 + 39818^2 .

It is a cyclic number.

It is not a de Polignac number, because 2643869213 - 2⁴ = 2643869197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2643869203) 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, 7641068 + ... + 7641413.

It is an arithmetic number, because the mean of its divisors is an integer number (664787967).

Almost surely, 2^2643869213 is an apocalyptic number.

It is an amenable number.

2643869213 is a deficient number, since it is larger than the sum of its proper divisors (15282655).

2643869213 is a wasteful number, since it uses less digits than its factorization.

2643869213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15282654.

The product of its digits is 373248, while the sum is 44.

The square root of 2643869213 is about 51418.5687568217. The cubic root of 2643869213 is about 1382.7595158904.

The spelling of 2643869213 in words is "two billion, six hundred forty-three million, eight hundred sixty-nine thousand, two hundred thirteen".