2311721345 has 8 divisors (see below), whose sum is σ = 2784614976. Its totient is φ = 1842344176.

The previous prime is 2311721309. The next prime is 2311721369. The reversal of 2311721345 is 5431271132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2311721345 - 2⁶ = 2311721281 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 877667 + ... + 880296.

It is an arithmetic number, because the mean of its divisors is an integer number (348076872).

Almost surely, 2^2311721345 is an apocalyptic number.

It is an amenable number.

2311721345 is a deficient number, since it is larger than the sum of its proper divisors (472893631).

2311721345 is a wasteful number, since it uses less digits than its factorization.

2311721345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1758231.

The product of its digits is 5040, while the sum is 29.

The square root of 2311721345 is about 48080.3634033687. The cubic root of 2311721345 is about 1322.2446780142.

Adding to 2311721345 its reverse (5431271132), we get a palindrome (7742992477).

The spelling of 2311721345 in words is "two billion, three hundred eleven million, seven hundred twenty-one thousand, three hundred forty-five".