509442061 has 2 divisors, whose sum is σ = 509442062. Its totient is φ = 509442060.

The previous prime is 509442053. The next prime is 509442067. The reversal of 509442061 is 160244905.

It is the 9215-th star number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 504900900 + 4541161 = 22470^2 + 2131^2 .

It is a cyclic number.

It is not a de Polignac number, because 509442061 - 2³ = 509442053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (509442067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254721030 + 254721031.

It is an arithmetic number, because the mean of its divisors is an integer number (254721031).

Almost surely, 2^509442061 is an apocalyptic number.

It is an amenable number.

509442061 is a deficient number, since it is larger than the sum of its proper divisors (1).

509442061 is an equidigital number, since it uses as much as digits as its factorization.

509442061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 509442061 is about 22570.8232237993. The cubic root of 509442061 is about 798.6655152801.

Adding to 509442061 its reverse (160244905), we get a palindrome (669686966).

The spelling of 509442061 in words is "five hundred nine million, four hundred forty-two thousand, sixty-one".