561321121 has 2 divisors, whose sum is σ = 561321122. Its totient is φ = 561321120.

The previous prime is 561321083. The next prime is 561321127. The reversal of 561321121 is 121123165.

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., 546390625 + 14930496 = 23375^2 + 3864^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561321121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 561321092 and 561321101.

It is not a weakly prime, because it can be changed into another prime (561321127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280660560 + 280660561.

It is an arithmetic number, because the mean of its divisors is an integer number (280660561).

Almost surely, 2^561321121 is an apocalyptic number.

It is an amenable number.

561321121 is a deficient number, since it is larger than the sum of its proper divisors (1).

561321121 is an equidigital number, since it uses as much as digits as its factorization.

561321121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 360, while the sum is 22.

The square root of 561321121 is about 23692.2164644847. The cubic root of 561321121 is about 824.9047314539.

Adding to 561321121 its reverse (121123165), we get a palindrome (682444286).

The spelling of 561321121 in words is "five hundred sixty-one million, three hundred twenty-one thousand, one hundred twenty-one".