506221889 has 2 divisors, whose sum is σ = 506221890. Its totient is φ = 506221888.

The previous prime is 506221879. The next prime is 506221949. The reversal of 506221889 is 988122605.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 281971264 + 224250625 = 16792^2 + 14975^2 .

It is a cyclic number.

It is not a de Polignac number, because 506221889 - 2⁸ = 506221633 is a prime.

It is not a weakly prime, because it can be changed into another prime (506221879) 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, 253110944 + 253110945.

It is an arithmetic number, because the mean of its divisors is an integer number (253110945).

Almost surely, 2^506221889 is an apocalyptic number.

It is an amenable number.

506221889 is a deficient number, since it is larger than the sum of its proper divisors (1).

506221889 is an equidigital number, since it uses as much as digits as its factorization.

506221889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 506221889 is about 22499.3753024390. The cubic root of 506221889 is about 796.9791748139.

The spelling of 506221889 in words is "five hundred six million, two hundred twenty-one thousand, eight hundred eighty-nine".