624509 has 2 divisors, whose sum is σ = 624510. Its totient is φ = 624508.

The previous prime is 624497. The next prime is 624517. The reversal of 624509 is 905426.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 504100 + 120409 = 710^2 + 347^2 .

It is a cyclic number.

It is not a de Polignac number, because 624509 - 2¹² = 620413 is a prime.

It is a super-2 number, since 2×624509² = 780022982162, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (624539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312254 + 312255.

It is an arithmetic number, because the mean of its divisors is an integer number (312255).

2⁶²⁴⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

624509 is a deficient number, since it is larger than the sum of its proper divisors (1).

624509 is an equidigital number, since it uses as much as digits as its factorization.

624509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 624509 is about 790.2588183627. The cubic root of 624509 is about 85.4764021832.

The spelling of 624509 in words is "six hundred twenty-four thousand, five hundred nine".