624541261 has 2 divisors, whose sum is σ = 624541262. Its totient is φ = 624541260.

The previous prime is 624541249. The next prime is 624541271. The reversal of 624541261 is 162145426.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 359860900 + 264680361 = 18970^2 + 16269^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-624541261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (624541231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312270630 + 312270631.

It is an arithmetic number, because the mean of its divisors is an integer number (312270631).

Almost surely, 2^624541261 is an apocalyptic number.

It is an amenable number.

624541261 is a deficient number, since it is larger than the sum of its proper divisors (1).

624541261 is an equidigital number, since it uses as much as digits as its factorization.

624541261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 31.

The square root of 624541261 is about 24990.8235358501. The cubic root of 624541261 is about 854.7787400973.

Adding to 624541261 its reverse (162145426), we get a palindrome (786686687).

The spelling of 624541261 in words is "six hundred twenty-four million, five hundred forty-one thousand, two hundred sixty-one".