2311638321 has 4 divisors (see below), whose sum is σ = 3082184432. Its totient is φ = 1541092212.

The previous prime is 2311638289. The next prime is 2311638341. The reversal of 2311638321 is 1238361132.

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 not a de Polignac number, because 2311638321 - 2⁵ = 2311638289 is a prime.

It is the 48080-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2311638341) by changing a digit.

It is a nontrivial repunit in base 48079.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 385273051 + ... + 385273056.

It is an arithmetic number, because the mean of its divisors is an integer number (770546108).

Almost surely, 2^2311638321 is an apocalyptic number.

It is an amenable number.

2311638321 is a deficient number, since it is larger than the sum of its proper divisors (770546111).

2311638321 is an equidigital number, since it uses as much as digits as its factorization.

2311638321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770546110.

The product of its digits is 5184, while the sum is 30.

The square root of 2311638321 is about 48079.5000077996. The cubic root of 2311638321 is about 1322.2288486328.

Adding to 2311638321 its reverse (1238361132), we get a palindrome (3549999453).

The spelling of 2311638321 in words is "two billion, three hundred eleven million, six hundred thirty-eight thousand, three hundred twenty-one".