2145312305 has 16 divisors (see below), whose sum is σ = 2594942784. Its totient is φ = 1702593600.

The previous prime is 2145312293. The next prime is 2145312307. The reversal of 2145312305 is 5032135412.

It is a happy number.

It is not a de Polignac number, because 2145312305 - 2¹⁴ = 2145295921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2145312307) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 329330 + ... + 335780.

It is an arithmetic number, because the mean of its divisors is an integer number (162183924).

Almost surely, 2^2145312305 is an apocalyptic number.

It is an amenable number.

2145312305 is a deficient number, since it is larger than the sum of its proper divisors (449630479).

2145312305 is a wasteful number, since it uses less digits than its factorization.

2145312305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6976.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 2145312305 is about 46317.5161790872. The cubic root of 2145312305 is about 1289.7241773528.

Adding to 2145312305 its reverse (5032135412), we get a palindrome (7177447717).

The spelling of 2145312305 in words is "two billion, one hundred forty-five million, three hundred twelve thousand, three hundred five".