4255689821 has 2 divisors, whose sum is σ = 4255689822. Its totient is φ = 4255689820.

The previous prime is 4255689817. The next prime is 4255689829. The reversal of 4255689821 is 1289865524.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2478645796 + 1777044025 = 49786^2 + 42155^2 .

It is a cyclic number.

It is not a de Polignac number, because 4255689821 - 2² = 4255689817 is a prime.

It is a super-2 number, since 2×4255689821² = 36221791705126024082, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 4255689821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4255689829) 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, 2127844910 + 2127844911.

It is an arithmetic number, because the mean of its divisors is an integer number (2127844911).

Almost surely, 2^4255689821 is an apocalyptic number.

It is an amenable number.

4255689821 is a deficient number, since it is larger than the sum of its proper divisors (1).

4255689821 is an equidigital number, since it uses as much as digits as its factorization.

4255689821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1382400, while the sum is 50.

The square root of 4255689821 is about 65235.6483910446. The cubic root of 4255689821 is about 1620.5284336402.

The spelling of 4255689821 in words is "four billion, two hundred fifty-five million, six hundred eighty-nine thousand, eight hundred twenty-one".