521207023 has 2 divisors, whose sum is σ = 521207024. Its totient is φ = 521207022.

The previous prime is 521207021. The next prime is 521207039. The reversal of 521207023 is 320702125.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521207023 - 2¹ = 521207021 is a prime.

Together with 521207021, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 521206985 and 521207003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521207021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260603511 + 260603512.

It is an arithmetic number, because the mean of its divisors is an integer number (260603512).

Almost surely, 2^521207023 is an apocalyptic number.

521207023 is a deficient number, since it is larger than the sum of its proper divisors (1).

521207023 is an equidigital number, since it uses as much as digits as its factorization.

521207023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 521207023 is about 22829.9588917720. The cubic root of 521207023 is about 804.7668643195.

Adding to 521207023 its reverse (320702125), we get a palindrome (841909148).

The spelling of 521207023 in words is "five hundred twenty-one million, two hundred seven thousand, twenty-three".