2781872273 has 2 divisors, whose sum is σ = 2781872274. Its totient is φ = 2781872272.

The previous prime is 2781872221. The next prime is 2781872309. The reversal of 2781872273 is 3722781872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1408651024 + 1373221249 = 37532^2 + 37057^2 .

It is a cyclic number.

It is not a de Polignac number, because 2781872273 - 2¹⁰ = 2781871249 is a prime.

It is not a weakly prime, because it can be changed into another prime (2789872273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390936136 + 1390936137.

It is an arithmetic number, because the mean of its divisors is an integer number (1390936137).

Almost surely, 2^2781872273 is an apocalyptic number.

It is an amenable number.

2781872273 is a deficient number, since it is larger than the sum of its proper divisors (1).

2781872273 is an equidigital number, since it uses as much as digits as its factorization.

2781872273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 526848, while the sum is 47.

The square root of 2781872273 is about 52743.4571582106. The cubic root of 2781872273 is about 1406.4114559562.

The spelling of 2781872273 in words is "two billion, seven hundred eighty-one million, eight hundred seventy-two thousand, two hundred seventy-three".