2287751821 has 2 divisors, whose sum is σ = 2287751822. Its totient is φ = 2287751820.

The previous prime is 2287751813. The next prime is 2287751831. The reversal of 2287751821 is 1281577822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1234749321 + 1053002500 = 35139^2 + 32450^2 .

It is a cyclic number.

It is not a de Polignac number, because 2287751821 - 2³ = 2287751813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2287751801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1143875910 + 1143875911.

It is an arithmetic number, because the mean of its divisors is an integer number (1143875911).

Almost surely, 2^2287751821 is an apocalyptic number.

It is an amenable number.

2287751821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2287751821 is an equidigital number, since it uses as much as digits as its factorization.

2287751821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 125440, while the sum is 43.

The square root of 2287751821 is about 47830.4486807306. The cubic root of 2287751821 is about 1317.6588093789.

The spelling of 2287751821 in words is "two billion, two hundred eighty-seven million, seven hundred fifty-one thousand, eight hundred twenty-one".