2145513311 has 4 divisors (see below), whose sum is σ = 2145618552. Its totient is φ = 2145408072.

The previous prime is 2145513281. The next prime is 2145513319. The reversal of 2145513311 is 1133155412.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2145513311 - 2²² = 2141319007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145513319) 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, 11141 + ... + 66446.

It is an arithmetic number, because the mean of its divisors is an integer number (536404638).

Almost surely, 2^2145513311 is an apocalyptic number.

2145513311 is a deficient number, since it is larger than the sum of its proper divisors (105241).

2145513311 is an equidigital number, since it uses as much as digits as its factorization.

2145513311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105240.

The product of its digits is 1800, while the sum is 26.

The square root of 2145513311 is about 46319.6859985039. The cubic root of 2145513311 is about 1289.7644565236.

Adding to 2145513311 its reverse (1133155412), we get a palindrome (3278668723).

The spelling of 2145513311 in words is "two billion, one hundred forty-five million, five hundred thirteen thousand, three hundred eleven".