515642489 has 2 divisors, whose sum is σ = 515642490. Its totient is φ = 515642488.

The previous prime is 515642467. The next prime is 515642597. The reversal of 515642489 is 984246515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 513792889 + 1849600 = 22667^2 + 1360^2 .

It is a cyclic number.

It is not a de Polignac number, because 515642489 - 2¹² = 515638393 is a prime.

It is not a weakly prime, because it can be changed into another prime (515642429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 257821244 + 257821245.

It is an arithmetic number, because the mean of its divisors is an integer number (257821245).

Almost surely, 2^515642489 is an apocalyptic number.

It is an amenable number.

515642489 is a deficient number, since it is larger than the sum of its proper divisors (1).

515642489 is an equidigital number, since it uses as much as digits as its factorization.

515642489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 345600, while the sum is 44.

The square root of 515642489 is about 22707.7627475716. The cubic root of 515642489 is about 801.8926485084.

The spelling of 515642489 in words is "five hundred fifteen million, six hundred forty-two thousand, four hundred eighty-nine".