523621 has 16 divisors (see below), whose sum is σ = 655360. Its totient is φ = 408240.

The previous prime is 523603. The next prime is 523631. The reversal of 523621 is 126325.

It is a happy number.

It is not a de Polignac number, because 523621 - 2⁷ = 523493 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4060 + ... + 4186.

It is an arithmetic number, because the mean of its divisors is an integer number (40960).

2⁵²³⁶²¹ is an apocalyptic number.

It is an amenable number.

523621 is a deficient number, since it is larger than the sum of its proper divisors (131739).

523621 is a wasteful number, since it uses less digits than its factorization.

523621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184.

The product of its digits is 360, while the sum is 19.

The square root of 523621 is about 723.6166111968. The cubic root of 523621 is about 80.6007380476.

Adding to 523621 its reverse (126325), we get a palindrome (649946).

The spelling of 523621 in words is "five hundred twenty-three thousand, six hundred twenty-one".