521629 has 4 divisors (see below), whose sum is σ = 527580. Its totient is φ = 515680.

The previous prime is 521603. The next prime is 521641. The reversal of 521629 is 926125.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 164025 + 357604 = 405^2 + 598^2 .

It is a cyclic number.

It is not a de Polignac number, because 521629 - 2¹¹ = 519581 is a prime.

It is a Duffinian number.

521629 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521659) 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, 2842 + ... + 3019.

It is an arithmetic number, because the mean of its divisors is an integer number (131895).

2⁵²¹⁶²⁹ is an apocalyptic number.

It is an amenable number.

521629 is a deficient number, since it is larger than the sum of its proper divisors (5951).

521629 is an equidigital number, since it uses as much as digits as its factorization.

521629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5950.

The product of its digits is 1080, while the sum is 25.

The square root of 521629 is about 722.2388801498. The cubic root of 521629 is about 80.4983989497.

Subtracting 521629 from its reverse (926125), we obtain a square (404496 = 636²).

It can be divided in two parts, 52 and 1629, that added together give a square (1681 = 41²).

The spelling of 521629 in words is "five hundred twenty-one thousand, six hundred twenty-nine".