2145240043 has 2 divisors, whose sum is σ = 2145240044. Its totient is φ = 2145240042.

The previous prime is 2145240017. The next prime is 2145240077. The reversal of 2145240043 is 3400425412.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2145240043 - 2²⁹ = 1608369131 is a prime.

It is not a weakly prime, because it can be changed into another prime (2145240743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072620021 + 1072620022.

It is an arithmetic number, because the mean of its divisors is an integer number (1072620022).

Almost surely, 2^2145240043 is an apocalyptic number.

2145240043 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145240043 is an equidigital number, since it uses as much as digits as its factorization.

2145240043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 2145240043 is about 46316.7361004637. The cubic root of 2145240043 is about 1289.7096963074.

Adding to 2145240043 its reverse (3400425412), we get a palindrome (5545665455).

The spelling of 2145240043 in words is "two billion, one hundred forty-five million, two hundred forty thousand, forty-three".