521516263 has 2 divisors, whose sum is σ = 521516264. Its totient is φ = 521516262.

The previous prime is 521516239. The next prime is 521516273. The reversal of 521516263 is 362615125.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 521516263 - 2⁹ = 521515751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521516213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260758131 + 260758132.

It is an arithmetic number, because the mean of its divisors is an integer number (260758132).

Almost surely, 2^521516263 is an apocalyptic number.

521516263 is a deficient number, since it is larger than the sum of its proper divisors (1).

521516263 is an equidigital number, since it uses as much as digits as its factorization.

521516263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 31.

The square root of 521516263 is about 22836.7305672244. The cubic root of 521516263 is about 804.9259929650.

The spelling of 521516263 in words is "five hundred twenty-one million, five hundred sixteen thousand, two hundred sixty-three".