2145540043 has 2 divisors, whose sum is σ = 2145540044. Its totient is φ = 2145540042.

The previous prime is 2145539987. The next prime is 2145540079. The reversal of 2145540043 is 3400455412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2145540043 is a prime.

It is a super-2 number, since 2×2145540043² = 9206684152232883698, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2145539993 and 2145540020.

It is not a weakly prime, because it can be changed into another prime (2145540143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072770021 + 1072770022.

It is an arithmetic number, because the mean of its divisors is an integer number (1072770022).

Almost surely, 2^2145540043 is an apocalyptic number.

2145540043 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145540043 is an equidigital number, since it uses as much as digits as its factorization.

2145540043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 2145540043 is about 46319.9745574196. The cubic root of 2145540043 is about 1289.7698131034.

Adding to 2145540043 its reverse (3400455412), we get a palindrome (5545995455).

The spelling of 2145540043 in words is "two billion, one hundred forty-five million, five hundred forty thousand, forty-three".