624413261 has 2 divisors, whose sum is σ = 624413262. Its totient is φ = 624413260.

The previous prime is 624413249. The next prime is 624413303. The reversal of 624413261 is 162314426.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 333062500 + 291350761 = 18250^2 + 17069^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-624413261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (624413201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312206630 + 312206631.

It is an arithmetic number, because the mean of its divisors is an integer number (312206631).

Almost surely, 2^624413261 is an apocalyptic number.

It is an amenable number.

624413261 is a deficient number, since it is larger than the sum of its proper divisors (1).

624413261 is an equidigital number, since it uses as much as digits as its factorization.

624413261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 29.

The square root of 624413261 is about 24988.2624646053. The cubic root of 624413261 is about 854.7203403506.

Adding to 624413261 its reverse (162314426), we get a palindrome (786727687).

The spelling of 624413261 in words is "six hundred twenty-four million, four hundred thirteen thousand, two hundred sixty-one".