2171313257 has 4 divisors (see below), whose sum is σ = 2171470416. Its totient is φ = 2171156100.

The previous prime is 2171313223. The next prime is 2171313269. The reversal of 2171313257 is 7523131712.

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 a de Polignac number, because none of the positive numbers 2^k-2171313257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2171313757) 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, 55619 + ... + 86232.

It is an arithmetic number, because the mean of its divisors is an integer number (542867604).

Almost surely, 2^2171313257 is an apocalyptic number.

It is an amenable number.

2171313257 is a deficient number, since it is larger than the sum of its proper divisors (157159).

2171313257 is a wasteful number, since it uses less digits than its factorization.

2171313257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157158.

The product of its digits is 8820, while the sum is 32.

The square root of 2171313257 is about 46597.3524677100. The cubic root of 2171313257 is about 1294.9137069257.

Adding to 2171313257 its reverse (7523131712), we get a palindrome (9694444969).

The spelling of 2171313257 in words is "two billion, one hundred seventy-one million, three hundred thirteen thousand, two hundred fifty-seven".