2311213133 has 4 divisors (see below), whose sum is σ = 2315485788. Its totient is φ = 2306940480.

The previous prime is 2311213129. The next prime is 2311213139. The reversal of 2311213133 is 3313121132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 659359684 + 1651853449 = 25678^2 + 40643^2 .

It is a cyclic number.

It is not a de Polignac number, because 2311213133 - 2² = 2311213129 is a prime.

It is a super-2 number, since 2×2311213133² = 10683412292303351378, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2311213139) 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, 2135516 + ... + 2136597.

It is an arithmetic number, because the mean of its divisors is an integer number (578871447).

Almost surely, 2^2311213133 is an apocalyptic number.

It is an amenable number.

2311213133 is a deficient number, since it is larger than the sum of its proper divisors (4272655).

2311213133 is an equidigital number, since it uses as much as digits as its factorization.

2311213133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4272654.

The product of its digits is 324, while the sum is 20.

The square root of 2311213133 is about 48075.0780862600. The cubic root of 2311213133 is about 1322.1477762166.

Adding to 2311213133 its reverse (3313121132), we get a palindrome (5624334265).

The spelling of 2311213133 in words is "two billion, three hundred eleven million, two hundred thirteen thousand, one hundred thirty-three".