2155743943 has 4 divisors (see below), whose sum is σ = 2155857120. Its totient is φ = 2155630768.

The previous prime is 2155743929. The next prime is 2155744037. The reversal of 2155743943 is 3493475512.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2155743943 - 2⁹ = 2155743431 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2155743943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155743923) 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, 20230 + ... + 68707.

It is an arithmetic number, because the mean of its divisors is an integer number (538964280).

Almost surely, 2^2155743943 is an apocalyptic number.

2155743943 is a deficient number, since it is larger than the sum of its proper divisors (113177).

2155743943 is an equidigital number, since it uses as much as digits as its factorization.

2155743943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113176.

The product of its digits is 453600, while the sum is 43.

The square root of 2155743943 is about 46429.9896941621. The cubic root of 2155743943 is about 1291.8112375474.

The spelling of 2155743943 in words is "two billion, one hundred fifty-five million, seven hundred forty-three thousand, nine hundred forty-three".