705520321 has 4 divisors (see below), whose sum is σ = 769658544. Its totient is φ = 641382100.

The previous prime is 705520303. The next prime is 705520339. The reversal of 705520321 is 123025507.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 123025507 = 11 ⋅11184137.

It is an interprime number because it is at equal distance from previous prime (705520303) and next prime (705520339).

It is a cyclic number.

It is not a de Polignac number, because 705520321 - 2⁹ = 705519809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (705520301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32069095 + ... + 32069116.

It is an arithmetic number, because the mean of its divisors is an integer number (192414636).

Almost surely, 2^705520321 is an apocalyptic number.

It is an amenable number.

705520321 is a deficient number, since it is larger than the sum of its proper divisors (64138223).

705520321 is a wasteful number, since it uses less digits than its factorization.

705520321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64138222.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 705520321 is about 26561.6324987754. The cubic root of 705520321 is about 890.2319477096.

Adding to 705520321 its reverse (123025507), we get a palindrome (828545828).

The spelling of 705520321 in words is "seven hundred five million, five hundred twenty thousand, three hundred twenty-one".