2311331161 has 2 divisors, whose sum is σ = 2311331162. Its totient is φ = 2311331160.

The previous prime is 2311331149. The next prime is 2311331257. The reversal of 2311331161 is 1611331132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1779152400 + 532178761 = 42180^2 + 23069^2 .

It is a cyclic number.

It is not a de Polignac number, because 2311331161 - 2⁹ = 2311330649 is a prime.

It is not a weakly prime, because it can be changed into another prime (2311331861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1155665580 + 1155665581.

It is an arithmetic number, because the mean of its divisors is an integer number (1155665581).

Almost surely, 2^2311331161 is an apocalyptic number.

It is an amenable number.

2311331161 is a deficient number, since it is larger than the sum of its proper divisors (1).

2311331161 is an equidigital number, since it uses as much as digits as its factorization.

2311331161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324, while the sum is 22.

The square root of 2311331161 is about 48076.3056088964. The cubic root of 2311331161 is about 1322.1702821175.

Adding to 2311331161 its reverse (1611331132), we get a palindrome (3922662293).

The spelling of 2311331161 in words is "two billion, three hundred eleven million, three hundred thirty-one thousand, one hundred sixty-one".