868519291 has 4 divisors (see below), whose sum is σ = 869129352. Its totient is φ = 867909232.

The previous prime is 868519247. The next prime is 868519319. The reversal of 868519291 is 192915868.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-868519291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (868519991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302890 + ... + 305743.

It is an arithmetic number, because the mean of its divisors is an integer number (217282338).

Almost surely, 2^868519291 is an apocalyptic number.

868519291 is a deficient number, since it is larger than the sum of its proper divisors (610061).

868519291 is a wasteful number, since it uses less digits than its factorization.

868519291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610060.

The product of its digits is 311040, while the sum is 49.

The square root of 868519291 is about 29470.6513501144. The cubic root of 868519291 is about 954.0983754823.

The spelling of 868519291 in words is "eight hundred sixty-eight million, five hundred nineteen thousand, two hundred ninety-one".