561240101 has 2 divisors, whose sum is σ = 561240102. Its totient is φ = 561240100.

The previous prime is 561240083. The next prime is 561240109. The reversal of 561240101 is 101042165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 370524001 + 190716100 = 19249^2 + 13810^2 .

It is a cyclic number.

It is not a de Polignac number, because 561240101 - 2¹⁴ = 561223717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561240109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280620050 + 280620051.

It is an arithmetic number, because the mean of its divisors is an integer number (280620051).

Almost surely, 2^561240101 is an apocalyptic number.

It is an amenable number.

561240101 is a deficient number, since it is larger than the sum of its proper divisors (1).

561240101 is an equidigital number, since it uses as much as digits as its factorization.

561240101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 561240101 is about 23690.5065585352. The cubic root of 561240101 is about 824.8650411622.

Adding to 561240101 its reverse (101042165), we get a palindrome (662282266).

The spelling of 561240101 in words is "five hundred sixty-one million, two hundred forty thousand, one hundred one".