2123543999 has 4 divisors (see below), whose sum is σ = 2126243064. Its totient is φ = 2120844936.

The previous prime is 2123543963. The next prime is 2123544061. The reversal of 2123543999 is 9993453212.

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 2123543999 - 2¹² = 2123539903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123543909) 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, 1348352 + ... + 1349925.

It is an arithmetic number, because the mean of its divisors is an integer number (531560766).

Almost surely, 2^2123543999 is an apocalyptic number.

2123543999 is a deficient number, since it is larger than the sum of its proper divisors (2699065).

2123543999 is an equidigital number, since it uses as much as digits as its factorization.

2123543999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2699064.

The product of its digits is 524880, while the sum is 47.

The square root of 2123543999 is about 46081.9270321891. The cubic root of 2123543999 is about 1285.3470977648.

The spelling of 2123543999 in words is "two billion, one hundred twenty-three million, five hundred forty-three thousand, nine hundred ninety-nine".