705617521 has 16 divisors (see below), whose sum is σ = 868337280. Its totient is φ = 559584000.

The previous prime is 705617513. The next prime is 705617551. The reversal of 705617521 is 125716507.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 705617521 - 2³ = 705617513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (705617551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43230 + ... + 57271.

It is an arithmetic number, because the mean of its divisors is an integer number (54271080).

Almost surely, 2^705617521 is an apocalyptic number.

It is an amenable number.

705617521 is a deficient number, since it is larger than the sum of its proper divisors (162719759).

705617521 is a wasteful number, since it uses less digits than its factorization.

705617521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100584.

The product of its (nonzero) digits is 14700, while the sum is 34.

The square root of 705617521 is about 26563.4621425747. The cubic root of 705617521 is about 890.2728284464.

The spelling of 705617521 in words is "seven hundred five million, six hundred seventeen thousand, five hundred twenty-one".