561201611 has 2 divisors, whose sum is σ = 561201612. Its totient is φ = 561201610.

The previous prime is 561201593. The next prime is 561201623. The reversal of 561201611 is 116102165.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561201611 is a prime.

It is not a weakly prime, because it can be changed into another prime (561201631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280600805 + 280600806.

It is an arithmetic number, because the mean of its divisors is an integer number (280600806).

Almost surely, 2^561201611 is an apocalyptic number.

561201611 is a deficient number, since it is larger than the sum of its proper divisors (1).

561201611 is an equidigital number, since it uses as much as digits as its factorization.

561201611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 561201611 is about 23689.6941938895. The cubic root of 561201611 is about 824.8461842409.

Adding to 561201611 its reverse (116102165), we get a palindrome (677303776).

The spelling of 561201611 in words is "five hundred sixty-one million, two hundred one thousand, six hundred eleven".