561226751 has 4 divisors (see below), whose sum is σ = 561315000. Its totient is φ = 561138504.

The previous prime is 561226747. The next prime is 561226789. The reversal of 561226751 is 157622165.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 561226751 - 2² = 561226747 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 (561226651) 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, 33776 + ... + 47573.

It is an arithmetic number, because the mean of its divisors is an integer number (140328750).

Almost surely, 2^561226751 is an apocalyptic number.

561226751 is a deficient number, since it is larger than the sum of its proper divisors (88249).

561226751 is an equidigital number, since it uses as much as digits as its factorization.

561226751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88248.

The product of its digits is 25200, while the sum is 35.

The square root of 561226751 is about 23690.2247984269. The cubic root of 561226751 is about 824.8585008624.

The spelling of 561226751 in words is "five hundred sixty-one million, two hundred twenty-six thousand, seven hundred fifty-one".