561779239 has 4 divisors (see below), whose sum is σ = 642033424. Its totient is φ = 481525056.

The previous prime is 561779237. The next prime is 561779249. The reversal of 561779239 is 932977165.

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 561779239 - 2¹ = 561779237 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 561779192 and 561779201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561779233) 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, 40127082 + ... + 40127095.

It is an arithmetic number, because the mean of its divisors is an integer number (160508356).

Almost surely, 2^561779239 is an apocalyptic number.

561779239 is a deficient number, since it is larger than the sum of its proper divisors (80254185).

561779239 is an equidigital number, since it uses as much as digits as its factorization.

561779239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80254184.

The product of its digits is 714420, while the sum is 49.

The square root of 561779239 is about 23701.8826045527. The cubic root of 561779239 is about 825.1290836892.

The spelling of 561779239 in words is "five hundred sixty-one million, seven hundred seventy-nine thousand, two hundred thirty-nine".