2143313257 has 4 divisors (see below), whose sum is σ = 2146238020. Its totient is φ = 2140388496.

The previous prime is 2143313251. The next prime is 2143313327. The reversal of 2143313257 is 7523133412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2081549376 + 61763881 = 45624^2 + 7859^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2143313257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2143313251) 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, 1461282 + ... + 1462747.

It is an arithmetic number, because the mean of its divisors is an integer number (536559505).

Almost surely, 2^2143313257 is an apocalyptic number.

It is an amenable number.

2143313257 is a deficient number, since it is larger than the sum of its proper divisors (2924763).

2143313257 is an equidigital number, since it uses as much as digits as its factorization.

2143313257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2924762.

The product of its digits is 15120, while the sum is 31.

The square root of 2143313257 is about 46295.9313223095. The cubic root of 2143313257 is about 1289.3234553135.

Adding to 2143313257 its reverse (7523133412), we get a palindrome (9666446669).

The spelling of 2143313257 in words is "two billion, one hundred forty-three million, three hundred thirteen thousand, two hundred fifty-seven".