568138913 has 4 divisors (see below), whose sum is σ = 587729940. Its totient is φ = 548547888.

The previous prime is 568138889. The next prime is 568138951. The reversal of 568138913 is 319831865.

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

It can be written as a sum of positive squares in 2 ways, for example, as 486290704 + 81848209 = 22052^2 + 9047^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-568138913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (568138213) 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, 9795470 + ... + 9795527.

It is an arithmetic number, because the mean of its divisors is an integer number (146932485).

Almost surely, 2^568138913 is an apocalyptic number.

It is an amenable number.

568138913 is a deficient number, since it is larger than the sum of its proper divisors (19591027).

568138913 is a wasteful number, since it uses less digits than its factorization.

568138913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19591026.

The product of its digits is 155520, while the sum is 44.

The square root of 568138913 is about 23835.6647274625. The cubic root of 568138913 is about 828.2310576933.

The spelling of 568138913 in words is "five hundred sixty-eight million, one hundred thirty-eight thousand, nine hundred thirteen".