521663029 has 2 divisors, whose sum is σ = 521663030. Its totient is φ = 521663028.

The previous prime is 521662987. The next prime is 521663039. The reversal of 521663029 is 920366125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 380172004 + 141491025 = 19498^2 + 11895^2 .

It is a cyclic number.

It is not a de Polignac number, because 521663029 - 2²⁵ = 488108597 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 521662985 and 521663003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521663039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260831514 + 260831515.

It is an arithmetic number, because the mean of its divisors is an integer number (260831515).

Almost surely, 2^521663029 is an apocalyptic number.

It is an amenable number.

521663029 is a deficient number, since it is larger than the sum of its proper divisors (1).

521663029 is an equidigital number, since it uses as much as digits as its factorization.

521663029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 521663029 is about 22839.9437170935. The cubic root of 521663029 is about 805.0014937668.

The spelling of 521663029 in words is "five hundred twenty-one million, six hundred sixty-three thousand, twenty-nine".