568006991 has 4 divisors (see below), whose sum is σ = 568204632. Its totient is φ = 567809352.

The previous prime is 568006987. The next prime is 568007113. The reversal of 568006991 is 199600865.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 199600865 = 5 ⋅39920173.

It is a cyclic number.

It is not a de Polignac number, because 568006991 - 2² = 568006987 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 (568006951) 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, 94445 + ... + 100278.

It is an arithmetic number, because the mean of its divisors is an integer number (142051158).

Almost surely, 2^568006991 is an apocalyptic number.

568006991 is a deficient number, since it is larger than the sum of its proper divisors (197641).

568006991 is a wasteful number, since it uses less digits than its factorization.

568006991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197640.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 568006991 is about 23832.8972430966. The cubic root of 568006991 is about 828.1669475768.

The spelling of 568006991 in words is "five hundred sixty-eight million, six thousand, nine hundred ninety-one".