2815138945 has 4 divisors (see below), whose sum is σ = 3378166740. Its totient is φ = 2252111152.

The previous prime is 2815138903. The next prime is 2815138951. The reversal of 2815138945 is 5498315182.

2815138945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 990738576 + 1824400369 = 31476^2 + 42713^2 .

It is a cyclic number.

It is not a de Polignac number, because 2815138945 - 2¹⁹ = 2814614657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2815138895 and 2815138904.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281513890 + ... + 281513899.

It is an arithmetic number, because the mean of its divisors is an integer number (844541685).

Almost surely, 2^2815138945 is an apocalyptic number.

It is an amenable number.

2815138945 is a deficient number, since it is larger than the sum of its proper divisors (563027795).

2815138945 is an equidigital number, since it uses as much as digits as its factorization.

2815138945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563027794.

The product of its digits is 345600, while the sum is 46.

The square root of 2815138945 is about 53057.8829675667. The cubic root of 2815138945 is about 1411.9953883932.

The spelling of 2815138945 in words is "two billion, eight hundred fifteen million, one hundred thirty-eight thousand, nine hundred forty-five".