509950621 has 2 divisors, whose sum is σ = 509950622. Its totient is φ = 509950620.

The previous prime is 509950561. The next prime is 509950657. The reversal of 509950621 is 126059905.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 263900025 + 246050596 = 16245^2 + 15686^2 .

It is a cyclic number.

It is not a de Polignac number, because 509950621 - 2⁹ = 509950109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (509950681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254975310 + 254975311.

It is an arithmetic number, because the mean of its divisors is an integer number (254975311).

Almost surely, 2^509950621 is an apocalyptic number.

It is an amenable number.

509950621 is a deficient number, since it is larger than the sum of its proper divisors (1).

509950621 is an equidigital number, since it uses as much as digits as its factorization.

509950621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24300, while the sum is 37.

The square root of 509950621 is about 22582.0862853723. The cubic root of 509950621 is about 798.9311877907.

The spelling of 509950621 in words is "five hundred nine million, nine hundred fifty thousand, six hundred twenty-one".