624521 has 2 divisors, whose sum is σ = 624522. Its totient is φ = 624520.

The previous prime is 624517. The next prime is 624539. The reversal of 624521 is 125426.

It is a happy number.

624521 is nontrivially palindromic in base 16.

624521 is an esthetic number in base 16, because in such base its adjacent digits differ by 1.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 546121 + 78400 = 739^2 + 280^2 .

It is a cyclic number.

It is not a de Polignac number, because 624521 - 2² = 624517 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p₅₀₉₅₁ and since 624521 and 50951 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 624493 and 624502.

It is not a weakly prime, because it can be changed into another prime (624541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312260 + 312261.

It is an arithmetic number, because the mean of its divisors is an integer number (312261).

2⁶²⁴⁵²¹ is an apocalyptic number.

It is an amenable number.

624521 is a deficient number, since it is larger than the sum of its proper divisors (1).

624521 is an equidigital number, since it uses as much as digits as its factorization.

624521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 480, while the sum is 20.

The square root of 624521 is about 790.2664107755. The cubic root of 624521 is about 85.4769496588.

Adding to 624521 its reverse (125426), we get a palindrome (749947).

The spelling of 624521 in words is "six hundred twenty-four thousand, five hundred twenty-one".