624459389 has 2 divisors, whose sum is σ = 624459390. Its totient is φ = 624459388.

The previous prime is 624459331. The next prime is 624459391. The reversal of 624459389 is 983954426.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 598193764 + 26265625 = 24458^2 + 5125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-624459389 is a prime.

It is a Sophie Germain prime.

Together with 624459391, it forms a pair of twin primes.

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 (624459089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312229694 + 312229695.

It is an arithmetic number, because the mean of its divisors is an integer number (312229695).

Almost surely, 2^624459389 is an apocalyptic number.

It is an amenable number.

624459389 is a deficient number, since it is larger than the sum of its proper divisors (1).

624459389 is an equidigital number, since it uses as much as digits as its factorization.

624459389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 50.

The square root of 624459389 is about 24989.1854409062. The cubic root of 624459389 is about 854.7413870791.

The spelling of 624459389 in words is "six hundred twenty-four million, four hundred fifty-nine thousand, three hundred eighty-nine".