2145811131 has 18 divisors (see below), whose sum is σ = 3117126948. Its totient is φ = 1422421560.

The previous prime is 2145811099. The next prime is 2145811139. The reversal of 2145811131 is 1311185412.

It is not a de Polignac number, because 2145811131 - 2⁵ = 2145811099 is a prime.

It is a super-2 number, since 2×2145811131² = 9209010819846998322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2145811095 and 2145811104.

It is not an unprimeable number, because it can be changed into a prime (2145811139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2018106 + ... + 2019168.

Almost surely, 2^2145811131 is an apocalyptic number.

2145811131 is a deficient number, since it is larger than the sum of its proper divisors (971315817).

2145811131 is an equidigital number, since it uses as much as digits as its factorization.

2145811131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2343 (or 1277 counting only the distinct ones).

The product of its digits is 960, while the sum is 27.

The square root of 2145811131 is about 46322.9007187590. The cubic root of 2145811131 is about 1289.8241314238.

Adding to 2145811131 its reverse (1311185412), we get a palindrome (3456996543).

The spelling of 2145811131 in words is "two billion, one hundred forty-five million, eight hundred eleven thousand, one hundred thirty-one".