2144251643 has 4 divisors (see below), whose sum is σ = 2148728640. Its totient is φ = 2139774648.

The previous prime is 2144251601. The next prime is 2144251649. The reversal of 2144251643 is 3461524412.

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 2144251643 - 2¹⁸ = 2143989499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2144251649) 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, 2237780 + ... + 2238737.

It is an arithmetic number, because the mean of its divisors is an integer number (537182160).

Almost surely, 2^2144251643 is an apocalyptic number.

2144251643 is a deficient number, since it is larger than the sum of its proper divisors (4476997).

2144251643 is an equidigital number, since it uses as much as digits as its factorization.

2144251643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4476996.

The product of its digits is 23040, while the sum is 32.

The square root of 2144251643 is about 46306.0648619595. The cubic root of 2144251643 is about 1289.5115918428.

The spelling of 2144251643 in words is "two billion, one hundred forty-four million, two hundred fifty-one thousand, six hundred forty-three".