2311431213 has 32 divisors (see below), whose sum is σ = 3796515072. Its totient is φ = 1218124800.

The previous prime is 2311431173. The next prime is 2311431223. The reversal of 2311431213 is 3121341132.

It is not a de Polignac number, because 2311431213 - 2¹⁰ = 2311430189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2311431213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2311431223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 368443 + ... + 374663.

It is an arithmetic number, because the mean of its divisors is an integer number (118641096).

Almost surely, 2^2311431213 is an apocalyptic number.

It is an amenable number.

2311431213 is a deficient number, since it is larger than the sum of its proper divisors (1485083859).

2311431213 is a wasteful number, since it uses less digits than its factorization.

2311431213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7605.

The product of its digits is 432, while the sum is 21.

The square root of 2311431213 is about 48077.3461518000. The cubic root of 2311431213 is about 1322.1893597058.

Adding to 2311431213 its reverse (3121341132), we get a palindrome (5432772345).

The spelling of 2311431213 in words is "two billion, three hundred eleven million, four hundred thirty-one thousand, two hundred thirteen".