521294663 has 2 divisors, whose sum is σ = 521294664. Its totient is φ = 521294662.

The previous prime is 521294597. The next prime is 521294723. The reversal of 521294663 is 366492125.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 521294663 - 2⁸ = 521294407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521294363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260647331 + 260647332.

It is an arithmetic number, because the mean of its divisors is an integer number (260647332).

Almost surely, 2^521294663 is an apocalyptic number.

521294663 is a deficient number, since it is larger than the sum of its proper divisors (1).

521294663 is an equidigital number, since it uses as much as digits as its factorization.

521294663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 38.

The square root of 521294663 is about 22831.8782188413. The cubic root of 521294663 is about 804.8119684797.

The spelling of 521294663 in words is "five hundred twenty-one million, two hundred ninety-four thousand, six hundred sixty-three".