521653 has 8 divisors (see below), whose sum is σ = 581760. Its totient is φ = 463680.

The previous prime is 521641. The next prime is 521657. The reversal of 521653 is 356125.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 521653 - 2¹⁷ = 390581 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 (521657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13 + ... + 1021.

It is an arithmetic number, because the mean of its divisors is an integer number (72720).

2⁵²¹⁶⁵³ is an apocalyptic number.

It is an amenable number.

521653 is a deficient number, since it is larger than the sum of its proper divisors (60107).

521653 is a wasteful number, since it uses less digits than its factorization.

521653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1067.

The product of its digits is 900, while the sum is 22.

The square root of 521653 is about 722.2554949601. The cubic root of 521653 is about 80.4996335001.

Adding to 521653 its reverse (356125), we get a palindrome (877778).

The spelling of 521653 in words is "five hundred twenty-one thousand, six hundred fifty-three".