2320517257 has 4 divisors (see below), whose sum is σ = 2325076740. Its totient is φ = 2315957776.

The previous prime is 2320517191. The next prime is 2320517299. The reversal of 2320517257 is 7527150232.

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 2041593856 + 278923401 = 45184^2 + 16701^2 .

It is a cyclic number.

It is not a de Polignac number, because 2320517257 - 2²⁷ = 2186299529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2320517657) 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, 2278978 + ... + 2279995.

It is an arithmetic number, because the mean of its divisors is an integer number (581269185).

Almost surely, 2^2320517257 is an apocalyptic number.

It is an amenable number.

2320517257 is a deficient number, since it is larger than the sum of its proper divisors (4559483).

2320517257 is an equidigital number, since it uses as much as digits as its factorization.

2320517257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4559482.

The product of its (nonzero) digits is 29400, while the sum is 34.

The square root of 2320517257 is about 48171.7474978851. The cubic root of 2320517257 is about 1323.9195667451.

Adding to 2320517257 its reverse (7527150232), we get a palindrome (9847667489).

The spelling of 2320517257 in words is "two billion, three hundred twenty million, five hundred seventeen thousand, two hundred fifty-seven".