506221109 has 2 divisors, whose sum is σ = 506221110. Its totient is φ = 506221108.

The previous prime is 506221097. The next prime is 506221117. The reversal of 506221109 is 901122605.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 408646225 + 97574884 = 20215^2 + 9878^2 .

It is a cyclic number.

It is not a de Polignac number, because 506221109 - 2¹² = 506217013 is a prime.

It is a super-2 number, since 2×506221109² = 512519622394379762, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (506221609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 253110554 + 253110555.

It is an arithmetic number, because the mean of its divisors is an integer number (253110555).

Almost surely, 2^506221109 is an apocalyptic number.

It is an amenable number.

506221109 is a deficient number, since it is larger than the sum of its proper divisors (1).

506221109 is an equidigital number, since it uses as much as digits as its factorization.

506221109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 506221109 is about 22499.3579686177. The cubic root of 506221109 is about 796.9787654782.

The spelling of 506221109 in words is "five hundred six million, two hundred twenty-one thousand, one hundred nine".