517642243 has 2 divisors, whose sum is σ = 517642244. Its totient is φ = 517642242.

The previous prime is 517642219. The next prime is 517642253. The reversal of 517642243 is 342246715.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 517642243 - 2²¹ = 515545091 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 517642199 and 517642208.

It is not a weakly prime, because it can be changed into another prime (517642253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258821121 + 258821122.

It is an arithmetic number, because the mean of its divisors is an integer number (258821122).

Almost surely, 2^517642243 is an apocalyptic number.

517642243 is a deficient number, since it is larger than the sum of its proper divisors (1).

517642243 is an equidigital number, since it uses as much as digits as its factorization.

517642243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 34.

The square root of 517642243 is about 22751.7525259045. The cubic root of 517642243 is about 802.9279391215.

Adding to 517642243 its reverse (342246715), we get a palindrome (859888958).

The spelling of 517642243 in words is "five hundred seventeen million, six hundred forty-two thousand, two hundred forty-three".