2145511331 has 4 divisors (see below), whose sum is σ = 2258433000. Its totient is φ = 2032589664.

The previous prime is 2145511297. The next prime is 2145511339. The reversal of 2145511331 is 1331155412.

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 2145511331 - 2³⁰ = 1071769507 is a prime.

It is a super-2 number, since 2×2145511331² = 9206437742898783122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2145511331.

It is not an unprimeable number, because it can be changed into a prime (2145511339) 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, 56460806 + ... + 56460843.

It is an arithmetic number, because the mean of its divisors is an integer number (564608250).

Almost surely, 2^2145511331 is an apocalyptic number.

2145511331 is a deficient number, since it is larger than the sum of its proper divisors (112921669).

2145511331 is a wasteful number, since it uses less digits than its factorization.

2145511331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112921668.

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

The square root of 2145511331 is about 46319.6646252971. The cubic root of 2145511331 is about 1289.7640597678.

Adding to 2145511331 its reverse (1331155412), we get a palindrome (3476666743).

The spelling of 2145511331 in words is "two billion, one hundred forty-five million, five hundred eleven thousand, three hundred thirty-one".