509141021 has 2 divisors, whose sum is σ = 509141022. Its totient is φ = 509141020.

The previous prime is 509141011. The next prime is 509141033. The reversal of 509141021 is 120141905.

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., 309936025 + 199204996 = 17605^2 + 14114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-509141021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (509141011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254570510 + 254570511.

It is an arithmetic number, because the mean of its divisors is an integer number (254570511).

Almost surely, 2^509141021 is an apocalyptic number.

It is an amenable number.

509141021 is a deficient number, since it is larger than the sum of its proper divisors (1).

509141021 is an equidigital number, since it uses as much as digits as its factorization.

509141021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 509141021 is about 22564.1534518803. The cubic root of 509141021 is about 798.5081682142.

Adding to 509141021 its reverse (120141905), we get a palindrome (629282926).

The spelling of 509141021 in words is "five hundred nine million, one hundred forty-one thousand, twenty-one".