525621 has 8 divisors (see below), whose sum is σ = 704704. Its totient is φ = 348480.

The previous prime is 525607. The next prime is 525641. The reversal of 525621 is 126525.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 525621 - 2⁷ = 525493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (525641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 360 + ... + 1086.

It is an arithmetic number, because the mean of its divisors is an integer number (88088).

2⁵²⁵⁶²¹ is an apocalyptic number.

It is an amenable number.

525621 is a deficient number, since it is larger than the sum of its proper divisors (179083).

525621 is a wasteful number, since it uses less digits than its factorization.

525621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 971.

The product of its digits is 600, while the sum is 21.

The square root of 525621 is about 724.9972413741. The cubic root of 525621 is about 80.7032273615.

It can be divided in two parts, 52 and 5621, that multiplied together give a palindrome (292292).

The spelling of 525621 in words is "five hundred twenty-five thousand, six hundred twenty-one".