268681391 has 16 divisors (see below), whose sum is σ = 298350240. Its totient is φ = 239915520.

The previous prime is 268681381. The next prime is 268681409. The reversal of 268681391 is 193186862.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-268681391 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 (268681321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 250805 + ... + 251873.

It is an arithmetic number, because the mean of its divisors is an integer number (18646890).

Almost surely, 2^268681391 is an apocalyptic number.

268681391 is a deficient number, since it is larger than the sum of its proper divisors (29668849).

268681391 is a wasteful number, since it uses less digits than its factorization.

268681391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1466.

The product of its digits is 124416, while the sum is 44.

The square root of 268681391 is about 16391.5036223038. The cubic root of 268681391 is about 645.2765202589.

The spelling of 268681391 in words is "two hundred sixty-eight million, six hundred eighty-one thousand, three hundred ninety-one".