2143531553 has 4 divisors (see below), whose sum is σ = 2193381168. Its totient is φ = 2093681940.

The previous prime is 2143531541. The next prime is 2143531561. The reversal of 2143531553 is 3551353412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2143531553 - 2⁸ = 2143531297 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2143531583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24924743 + ... + 24924828.

It is an arithmetic number, because the mean of its divisors is an integer number (548345292).

Almost surely, 2^2143531553 is an apocalyptic number.

It is an amenable number.

2143531553 is a deficient number, since it is larger than the sum of its proper divisors (49849615).

2143531553 is an equidigital number, since it uses as much as digits as its factorization.

2143531553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49849614.

The product of its digits is 27000, while the sum is 32.

The square root of 2143531553 is about 46298.2888776680. The cubic root of 2143531553 is about 1289.3672262675.

Adding to 2143531553 its reverse (3551353412), we get a palindrome (5694884965).

The spelling of 2143531553 in words is "two billion, one hundred forty-three million, five hundred thirty-one thousand, five hundred fifty-three".