2781801551 has 2 divisors, whose sum is σ = 2781801552. Its totient is φ = 2781801550.

The previous prime is 2781801509. The next prime is 2781801553. The reversal of 2781801551 is 1551081872.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2781801551 - 2⁶ = 2781801487 is a prime.

Together with 2781801553, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2781801553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390900775 + 1390900776.

It is an arithmetic number, because the mean of its divisors is an integer number (1390900776).

Almost surely, 2^2781801551 is an apocalyptic number.

2781801551 is a deficient number, since it is larger than the sum of its proper divisors (1).

2781801551 is an equidigital number, since it uses as much as digits as its factorization.

2781801551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22400, while the sum is 38.

The square root of 2781801551 is about 52742.7867200814. The cubic root of 2781801551 is about 1406.3995377150.

It can be divided in two parts, 2781801 and 551, that multiplied together give a palindrome (1532772351).

The spelling of 2781801551 in words is "two billion, seven hundred eighty-one million, eight hundred one thousand, five hundred fifty-one".