568461991 has 4 divisors (see below), whose sum is σ = 578097000. Its totient is φ = 558826984.

The previous prime is 568461979. The next prime is 568462049. The reversal of 568461991 is 199164865.

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 568461991 - 2⁷ = 568461863 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 (568461961) 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, 4817416 + ... + 4817533.

It is an arithmetic number, because the mean of its divisors is an integer number (144524250).

Almost surely, 2^568461991 is an apocalyptic number.

568461991 is a deficient number, since it is larger than the sum of its proper divisors (9635009).

568461991 is an equidigital number, since it uses as much as digits as its factorization.

568461991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9635008.

The product of its digits is 466560, while the sum is 49.

The square root of 568461991 is about 23842.4409614452. The cubic root of 568461991 is about 828.3880219628.

The spelling of 568461991 in words is "five hundred sixty-eight million, four hundred sixty-one thousand, nine hundred ninety-one".