705606521 has 2 divisors, whose sum is σ = 705606522. Its totient is φ = 705606520.

The previous prime is 705606509. The next prime is 705606527. The reversal of 705606521 is 125606507.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 697540921 + 8065600 = 26411^2 + 2840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-705606521 is a prime.

It is not a weakly prime, because it can be changed into another prime (705606527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 352803260 + 352803261.

It is an arithmetic number, because the mean of its divisors is an integer number (352803261).

Almost surely, 2^705606521 is an apocalyptic number.

It is an amenable number.

705606521 is a deficient number, since it is larger than the sum of its proper divisors (1).

705606521 is an equidigital number, since it uses as much as digits as its factorization.

705606521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 705606521 is about 26563.2550904440. The cubic root of 705606521 is about 890.2682022140.

The spelling of 705606521 in words is "seven hundred five million, six hundred six thousand, five hundred twenty-one".