268557191 has 12 divisors (see below), whose sum is σ = 328846680. Its totient is φ = 218075760.

The previous prime is 268557169. The next prime is 268557217. The reversal of 268557191 is 191755862.

It is not a de Polignac number, because 268557191 - 2¹⁸ = 268295047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (268557151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 143300 + ... + 145161.

It is an arithmetic number, because the mean of its divisors is an integer number (27403890).

Almost surely, 2^268557191 is an apocalyptic number.

268557191 is a deficient number, since it is larger than the sum of its proper divisors (60289489).

268557191 is a wasteful number, since it uses less digits than its factorization.

268557191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288494 (or 288487 counting only the distinct ones).

The product of its digits is 151200, while the sum is 44.

The square root of 268557191 is about 16387.7146362756. The cubic root of 268557191 is about 645.1770769546.

The spelling of 268557191 in words is "two hundred sixty-eight million, five hundred fifty-seven thousand, one hundred ninety-one".