2311438891 has 2 divisors, whose sum is σ = 2311438892. Its totient is φ = 2311438890.

The previous prime is 2311438879. The next prime is 2311438907. The reversal of 2311438891 is 1988341132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2311438891 - 2⁷ = 2311438763 is a prime.

It is not a weakly prime, because it can be changed into another prime (2311438861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1155719445 + 1155719446.

It is an arithmetic number, because the mean of its divisors is an integer number (1155719446).

Almost surely, 2^2311438891 is an apocalyptic number.

2311438891 is a deficient number, since it is larger than the sum of its proper divisors (1).

2311438891 is an equidigital number, since it uses as much as digits as its factorization.

2311438891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 40.

The square root of 2311438891 is about 48077.4260022310. The cubic root of 2311438891 is about 1322.1908236989.

The spelling of 2311438891 in words is "two billion, three hundred eleven million, four hundred thirty-eight thousand, eight hundred ninety-one".