515040242393 has 2 divisors, whose sum is σ = 515040242394. Its totient is φ = 515040242392.

The previous prime is 515040242383. The next prime is 515040242417. The reversal of 515040242393 is 393242040515.

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., 445845992089 + 69194250304 = 667717^2 + 263048^2 .

It is a cyclic number.

It is not a de Polignac number, because 515040242393 - 2¹⁸ = 515039980249 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (515040242323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 257520121196 + 257520121197.

It is an arithmetic number, because the mean of its divisors is an integer number (257520121197).

Almost surely, 2^515040242393 is an apocalyptic number.

It is an amenable number.

515040242393 is a deficient number, since it is larger than the sum of its proper divisors (1).

515040242393 is an equidigital number, since it uses as much as digits as its factorization.

515040242393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129600, while the sum is 38.

The spelling of 515040242393 in words is "five hundred fifteen billion, forty million, two hundred forty-two thousand, three hundred ninety-three".