561521013 has 4 divisors (see below), whose sum is σ = 748694688. Its totient is φ = 374347340.

The previous prime is 561520963. The next prime is 561521017. The reversal of 561521013 is 310125165.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 561521013 - 2¹⁸ = 561258869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561521017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93586833 + ... + 93586838.

It is an arithmetic number, because the mean of its divisors is an integer number (187173672).

Almost surely, 2^561521013 is an apocalyptic number.

It is an amenable number.

561521013 is a deficient number, since it is larger than the sum of its proper divisors (187173675).

561521013 is a wasteful number, since it uses less digits than its factorization.

561521013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187173674.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 561521013 is about 23696.4346052312. The cubic root of 561521013 is about 825.0026387427.

Adding to 561521013 its reverse (310125165), we get a palindrome (871646178).

The spelling of 561521013 in words is "five hundred sixty-one million, five hundred twenty-one thousand, thirteen".