561321461 has 2 divisors, whose sum is σ = 561321462. Its totient is φ = 561321460.

The previous prime is 561321289. The next prime is 561321473. The reversal of 561321461 is 164123165.

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., 501491236 + 59830225 = 22394^2 + 7735^2 .

It is a cyclic number.

It is not a de Polignac number, because 561321461 - 2¹⁰ = 561320437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561321661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280660730 + 280660731.

It is an arithmetic number, because the mean of its divisors is an integer number (280660731).

Almost surely, 2^561321461 is an apocalyptic number.

It is an amenable number.

561321461 is a deficient number, since it is larger than the sum of its proper divisors (1).

561321461 is an equidigital number, since it uses as much as digits as its factorization.

561321461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 29.

The square root of 561321461 is about 23692.2236398359. The cubic root of 561321461 is about 824.9048980060.

The spelling of 561321461 in words is "five hundred sixty-one million, three hundred twenty-one thousand, four hundred sixty-one".