2145778273 has 4 divisors (see below), whose sum is σ = 2180955028. Its totient is φ = 2110601520.

The previous prime is 2145778249. The next prime is 2145778289. The reversal of 2145778273 is 3728775412.

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 36397089 + 2109381184 = 6033^2 + 45928^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2145778273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2145788273) 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, 17588286 + ... + 17588407.

It is an arithmetic number, because the mean of its divisors is an integer number (545238757).

Almost surely, 2^2145778273 is an apocalyptic number.

It is an amenable number.

2145778273 is a deficient number, since it is larger than the sum of its proper divisors (35176755).

2145778273 is an equidigital number, since it uses as much as digits as its factorization.

2145778273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35176754.

The product of its digits is 658560, while the sum is 46.

The square root of 2145778273 is about 46322.5460548101. The cubic root of 2145778273 is about 1289.8175478594.

The spelling of 2145778273 in words is "two billion, one hundred forty-five million, seven hundred seventy-eight thousand, two hundred seventy-three".