509240581 has 2 divisors, whose sum is σ = 509240582. Its totient is φ = 509240580.

The previous prime is 509240569. The next prime is 509240621. The reversal of 509240581 is 185042905.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 360620100 + 148620481 = 18990^2 + 12191^2 .

It is a cyclic number.

It is not a de Polignac number, because 509240581 - 2⁷ = 509240453 is a prime.

It is a super-2 number, since 2×509240581² = 518651938674435122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (509240531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254620290 + 254620291.

It is an arithmetic number, because the mean of its divisors is an integer number (254620291).

Almost surely, 2^509240581 is an apocalyptic number.

It is an amenable number.

509240581 is a deficient number, since it is larger than the sum of its proper divisors (1).

509240581 is an equidigital number, since it uses as much as digits as its factorization.

509240581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 509240581 is about 22566.3594981557. The cubic root of 509240581 is about 798.5602129252.

The spelling of 509240581 in words is "five hundred nine million, two hundred forty thousand, five hundred eighty-one".