624011561 has 4 divisors (see below), whose sum is σ = 624067332. Its totient is φ = 623955792.

The previous prime is 624011543. The next prime is 624011569. The reversal of 624011561 is 165110426.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 298425625 + 325585936 = 17275^2 + 18044^2 .

It is a cyclic number.

It is not a de Polignac number, because 624011561 - 2⁶ = 624011497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 624011561.

It is not an unprimeable number, because it can be changed into a prime (624011569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4646 + ... + 35631.

It is an arithmetic number, because the mean of its divisors is an integer number (156016833).

Almost surely, 2^624011561 is an apocalyptic number.

It is an amenable number.

624011561 is a deficient number, since it is larger than the sum of its proper divisors (55771).

624011561 is a wasteful number, since it uses less digits than its factorization.

624011561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55770.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 624011561 is about 24980.2233977200. The cubic root of 624011561 is about 854.5370136795.

Adding to 624011561 its reverse (165110426), we get a palindrome (789121987).

The spelling of 624011561 in words is "six hundred twenty-four million, eleven thousand, five hundred sixty-one".