624725561 has 4 divisors (see below), whose sum is σ = 628918500. Its totient is φ = 620532624.

The previous prime is 624725527. The next prime is 624725581. The reversal of 624725561 is 165527426.

624725561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 165527426 = 2 ⋅82763713.

It can be written as a sum of positive squares in 2 ways, for example, as 29365561 + 595360000 = 5419^2 + 24400^2 .

It is a cyclic number.

It is not a de Polignac number, because 624725561 - 2¹⁸ = 624463417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (624725581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2096246 + ... + 2096543.

It is an arithmetic number, because the mean of its divisors is an integer number (157229625).

Almost surely, 2^624725561 is an apocalyptic number.

It is an amenable number.

624725561 is a deficient number, since it is larger than the sum of its proper divisors (4192939).

624725561 is a wasteful number, since it uses less digits than its factorization.

624725561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4192938.

The product of its digits is 100800, while the sum is 38.

The square root of 624725561 is about 24994.5106173336. The cubic root of 624725561 is about 854.8628125934.

The spelling of 624725561 in words is "six hundred twenty-four million, seven hundred twenty-five thousand, five hundred sixty-one".