2311031213 has 4 divisors (see below), whose sum is σ = 2311173180. Its totient is φ = 2310889248.

The previous prime is 2311031209. The next prime is 2311031243. The reversal of 2311031213 is 3121301132.

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 1336779844 + 974251369 = 36562^2 + 31213^2 .

It is a cyclic number.

It is not a de Polignac number, because 2311031213 - 2² = 2311031209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2311031191 and 2311031200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2311031243) 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, 42848 + ... + 80361.

It is an arithmetic number, because the mean of its divisors is an integer number (577793295).

Almost surely, 2^2311031213 is an apocalyptic number.

It is an amenable number.

2311031213 is a deficient number, since it is larger than the sum of its proper divisors (141967).

2311031213 is a wasteful number, since it uses less digits than its factorization.

2311031213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141966.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 2311031213 is about 48073.1860084185. The cubic root of 2311031213 is about 1322.1130857142.

Adding to 2311031213 its reverse (3121301132), we get a palindrome (5432332345).

The spelling of 2311031213 in words is "two billion, three hundred eleven million, thirty-one thousand, two hundred thirteen".