2312311861 has 2 divisors, whose sum is σ = 2312311862. Its totient is φ = 2312311860.

The previous prime is 2312311853. The next prime is 2312311867. The reversal of 2312311861 is 1681132132.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2200079025 + 112232836 = 46905^2 + 10594^2 .

It is a cyclic number.

It is not a de Polignac number, because 2312311861 - 2³ = 2312311853 is a prime.

It is a super-2 number, since 2×2312311861² = 10693572285042566642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2312311867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1156155930 + 1156155931.

It is an arithmetic number, because the mean of its divisors is an integer number (1156155931).

Almost surely, 2^2312311861 is an apocalyptic number.

It is an amenable number.

2312311861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2312311861 is an equidigital number, since it uses as much as digits as its factorization.

2312311861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 28.

The square root of 2312311861 is about 48086.5039382153. The cubic root of 2312311861 is about 1322.3572550433.

Adding to 2312311861 its reverse (1681132132), we get a palindrome (3993443993).

The spelling of 2312311861 in words is "two billion, three hundred twelve million, three hundred eleven thousand, eight hundred sixty-one".