2644988291 has 4 divisors (see below), whose sum is σ = 2885441784. Its totient is φ = 2404534800.

The previous prime is 2644988249. The next prime is 2644988321. The reversal of 2644988291 is 1928894462.

It is a happy number.

2644988291 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 is a cyclic number.

It is not a de Polignac number, because 2644988291 - 2¹⁴ = 2644971907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2644988221) 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, 120226730 + ... + 120226751.

It is an arithmetic number, because the mean of its divisors is an integer number (721360446).

Almost surely, 2^2644988291 is an apocalyptic number.

2644988291 is a deficient number, since it is larger than the sum of its proper divisors (240453493).

2644988291 is a wasteful number, since it uses less digits than its factorization.

2644988291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240453492.

The product of its digits is 1990656, while the sum is 53.

The square root of 2644988291 is about 51429.4496470651. The cubic root of 2644988291 is about 1382.9545832145.

The spelling of 2644988291 in words is "two billion, six hundred forty-four million, nine hundred eighty-eight thousand, two hundred ninety-one".