2143261311 has 4 divisors (see below), whose sum is σ = 2857681752. Its totient is φ = 1428840872.

The previous prime is 2143261273. The next prime is 2143261319. The reversal of 2143261311 is 1131623412.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2143261311 - 2¹⁷ = 2143130239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2143261319) 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, 357210216 + ... + 357210221.

It is an arithmetic number, because the mean of its divisors is an integer number (714420438).

Almost surely, 2^2143261311 is an apocalyptic number.

2143261311 is a deficient number, since it is larger than the sum of its proper divisors (714420441).

2143261311 is an equidigital number, since it uses as much as digits as its factorization.

2143261311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714420440.

The product of its digits is 864, while the sum is 24.

The square root of 2143261311 is about 46295.3702976874. The cubic root of 2143261311 is about 1289.3130390826.

Adding to 2143261311 its reverse (1131623412), we get a palindrome (3274884723).

The spelling of 2143261311 in words is "two billion, one hundred forty-three million, two hundred sixty-one thousand, three hundred eleven".