2311554721 has 4 divisors (see below), whose sum is σ = 2641776832. Its totient is φ = 1981332612.

The previous prime is 2311554673. The next prime is 2311554743. The reversal of 2311554721 is 1274551132.

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 2311554721 - 2¹⁹ = 2311030433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2311554121) 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, 165111045 + ... + 165111058.

It is an arithmetic number, because the mean of its divisors is an integer number (660444208).

Almost surely, 2^2311554721 is an apocalyptic number.

It is an amenable number.

2311554721 is a deficient number, since it is larger than the sum of its proper divisors (330222111).

2311554721 is an equidigital number, since it uses as much as digits as its factorization.

2311554721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330222110.

The product of its digits is 8400, while the sum is 31.

The square root of 2311554721 is about 48078.6306065387. The cubic root of 2311554721 is about 1322.2129090481.

The spelling of 2311554721 in words is "two billion, three hundred eleven million, five hundred fifty-four thousand, seven hundred twenty-one".