2143328257 has 6 divisors (see below), whose sum is σ = 2493259458. Its totient is φ = 1837138464.

The previous prime is 2143328207. The next prime is 2143328273. The reversal of 2143328257 is 7528233412.

It can be written as a sum of positive squares in only one way, i.e., 1607127921 + 536200336 = 40089^2 + 23156^2 .

It is not a de Polignac number, because 2143328257 - 2⁷ = 2143328129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2143328207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21870648 + ... + 21870745.

It is an arithmetic number, because the mean of its divisors is an integer number (415543243).

Almost surely, 2^2143328257 is an apocalyptic number.

It is an amenable number.

2143328257 is a deficient number, since it is larger than the sum of its proper divisors (349931201).

2143328257 is an equidigital number, since it uses as much as digits as its factorization.

2143328257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43741407 (or 43741400 counting only the distinct ones).

The product of its digits is 80640, while the sum is 37.

The square root of 2143328257 is about 46296.0933233032. The cubic root of 2143328257 is about 1289.3264630876.

The spelling of 2143328257 in words is "two billion, one hundred forty-three million, three hundred twenty-eight thousand, two hundred fifty-seven".