561222791 has 4 divisors (see below), whose sum is σ = 579326784. Its totient is φ = 543118800.

The previous prime is 561222787. The next prime is 561222833. The reversal of 561222791 is 197222165.

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 561222791 - 2² = 561222787 is a prime.

It is a super-2 number, since 2×561222791² = 629942042275659362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561222721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9051950 + ... + 9052011.

It is an arithmetic number, because the mean of its divisors is an integer number (144831696).

Almost surely, 2^561222791 is an apocalyptic number.

561222791 is a deficient number, since it is larger than the sum of its proper divisors (18103993).

561222791 is a wasteful number, since it uses less digits than its factorization.

561222791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18103992.

The product of its digits is 15120, while the sum is 35.

The square root of 561222791 is about 23690.1412195031. The cubic root of 561222791 is about 824.8565607984.

The spelling of 561222791 in words is "five hundred sixty-one million, two hundred twenty-two thousand, seven hundred ninety-one".