2143647551 has 4 divisors (see below), whose sum is σ = 2212797504. Its totient is φ = 2074497600.

The previous prime is 2143647547. The next prime is 2143647601. The reversal of 2143647551 is 1557463412.

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 2143647551 - 2² = 2143647547 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 (2143647851) 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 in 3 ways as a sum of consecutive naturals, for example, 34574930 + ... + 34574991.

It is an arithmetic number, because the mean of its divisors is an integer number (553199376).

Almost surely, 2^2143647551 is an apocalyptic number.

2143647551 is a deficient number, since it is larger than the sum of its proper divisors (69149953).

2143647551 is an equidigital number, since it uses as much as digits as its factorization.

2143647551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69149952.

The product of its digits is 100800, while the sum is 38.

The square root of 2143647551 is about 46299.5415852036. The cubic root of 2143647551 is about 1289.3904840422.

The spelling of 2143647551 in words is "two billion, one hundred forty-three million, six hundred forty-seven thousand, five hundred fifty-one".