2778732251 has 2 divisors, whose sum is σ = 2778732252. Its totient is φ = 2778732250.

The previous prime is 2778732241. The next prime is 2778732277. The reversal of 2778732251 is 1522378772.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2778732251 - 2¹⁴ = 2778715867 is a prime.

It is not a weakly prime, because it can be changed into another prime (2778732211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1389366125 + 1389366126.

It is an arithmetic number, because the mean of its divisors is an integer number (1389366126).

Almost surely, 2^2778732251 is an apocalyptic number.

2778732251 is a deficient number, since it is larger than the sum of its proper divisors (1).

2778732251 is an equidigital number, since it uses as much as digits as its factorization.

2778732251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 329280, while the sum is 44.

The square root of 2778732251 is about 52713.6818198084. The cubic root of 2778732251 is about 1405.8820971773.

The spelling of 2778732251 in words is "two billion, seven hundred seventy-eight million, seven hundred thirty-two thousand, two hundred fifty-one".