561913501 has 4 divisors (see below), whose sum is σ = 562125312. Its totient is φ = 561701692.

The previous prime is 561913489. The next prime is 561913507. The reversal of 561913501 is 105319165.

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 561913501 - 2²³ = 553524893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561913507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101875 + ... + 107248.

It is an arithmetic number, because the mean of its divisors is an integer number (140531328).

Almost surely, 2^561913501 is an apocalyptic number.

It is an amenable number.

561913501 is a deficient number, since it is larger than the sum of its proper divisors (211811).

561913501 is a wasteful number, since it uses less digits than its factorization.

561913501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211810.

The product of its (nonzero) digits is 4050, while the sum is 31.

The square root of 561913501 is about 23704.7147420086. The cubic root of 561913501 is about 825.1948121516.

The spelling of 561913501 in words is "five hundred sixty-one million, nine hundred thirteen thousand, five hundred one".