704521 has 2 divisors, whose sum is σ = 704522. Its totient is φ = 704520.

The previous prime is 704507. The next prime is 704527. The reversal of 704521 is 125407.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 698896 + 5625 = 836^2 + 75^2 .

It is an emirp because it is prime and its reverse (125407) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 704521 - 2⁷ = 704393 is a prime.

It is a nialpdrome in base 15.

It is not a weakly prime, because it can be changed into another prime (704527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 352260 + 352261.

It is an arithmetic number, because the mean of its divisors is an integer number (352261).

2⁷⁰⁴⁵²¹ is an apocalyptic number.

It is an amenable number.

704521 is a deficient number, since it is larger than the sum of its proper divisors (1).

704521 is an equidigital number, since it uses as much as digits as its factorization.

704521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 704521 is about 839.3574923714. The cubic root of 704521 is about 88.9811431666.

Adding to 704521 its reverse (125407), we get a palindrome (829928).

It can be divided in two parts, 704 and 521, that added together give a triangular number (1225 = T₄₉).

The spelling of 704521 in words is "seven hundred four thousand, five hundred twenty-one".