561043501 has 2 divisors, whose sum is σ = 561043502. Its totient is φ = 561043500.

The previous prime is 561043493. The next prime is 561043507. The reversal of 561043501 is 105340165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 560458276 + 585225 = 23674^2 + 765^2 .

It is a cyclic number.

It is not a de Polignac number, because 561043501 - 2³ = 561043493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561043507) 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 as a sum of consecutive naturals, namely, 280521750 + 280521751.

It is an arithmetic number, because the mean of its divisors is an integer number (280521751).

Almost surely, 2^561043501 is an apocalyptic number.

It is an amenable number.

561043501 is a deficient number, since it is larger than the sum of its proper divisors (1).

561043501 is an equidigital number, since it uses as much as digits as its factorization.

561043501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 561043501 is about 23686.3568536827. The cubic root of 561043501 is about 824.7687143518.

Adding to 561043501 its reverse (105340165), we get a palindrome (666383666).

The spelling of 561043501 in words is "five hundred sixty-one million, forty-three thousand, five hundred one".