521342243 has 2 divisors, whose sum is σ = 521342244. Its totient is φ = 521342242.

The previous prime is 521342203. The next prime is 521342249. The reversal of 521342243 is 342243125.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521342243 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (521342249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260671121 + 260671122.

It is an arithmetic number, because the mean of its divisors is an integer number (260671122).

Almost surely, 2^521342243 is an apocalyptic number.

521342243 is a deficient number, since it is larger than the sum of its proper divisors (1).

521342243 is an equidigital number, since it uses as much as digits as its factorization.

521342243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 26.

The square root of 521342243 is about 22832.9201592788. The cubic root of 521342243 is about 804.8364535367.

Adding to 521342243 its reverse (342243125), we get a palindrome (863585368).

The spelling of 521342243 in words is "five hundred twenty-one million, three hundred forty-two thousand, two hundred forty-three".