561500011 has 4 divisors (see below), whose sum is σ = 562487400. Its totient is φ = 560512624.

The previous prime is 561499997. The next prime is 561500029. The reversal of 561500011 is 110005165.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 110005165 = 5 ⋅22001033.

It is a cyclic number.

It is not a de Polignac number, because 561500011 - 2⁵ = 561499979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561500041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 492841 + ... + 493978.

It is an arithmetic number, because the mean of its divisors is an integer number (140621850).

Almost surely, 2^561500011 is an apocalyptic number.

561500011 is a deficient number, since it is larger than the sum of its proper divisors (987389).

561500011 is an equidigital number, since it uses as much as digits as its factorization.

561500011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 987388.

The product of its (nonzero) digits is 150, while the sum is 19.

The square root of 561500011 is about 23695.9914542523. The cubic root of 561500011 is about 824.9923530359.

Adding to 561500011 its reverse (110005165), we get a palindrome (671505176).

The spelling of 561500011 in words is "five hundred sixty-one million, five hundred thousand, eleven".