268321691 has 8 divisors (see below), whose sum is σ = 295733424. Its totient is φ = 241413120.

The previous prime is 268321687. The next prime is 268321699. The reversal of 268321691 is 196123862.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 268321691 - 2² = 268321687 is a prime.

It is a super-2 number, since 2×268321691² = 143993059722198962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (268321699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124670 + ... + 126803.

It is an arithmetic number, because the mean of its divisors is an integer number (36966678).

Almost surely, 2^268321691 is an apocalyptic number.

268321691 is a deficient number, since it is larger than the sum of its proper divisors (27411733).

268321691 is a wasteful number, since it uses less digits than its factorization.

268321691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251581.

The product of its digits is 31104, while the sum is 38.

The square root of 268321691 is about 16380.5277997994. The cubic root of 268321691 is about 644.9884347825.

The spelling of 268321691 in words is "two hundred sixty-eight million, three hundred twenty-one thousand, six hundred ninety-one".