268191893 has 2 divisors, whose sum is σ = 268191894. Its totient is φ = 268191892.

The previous prime is 268191877. The next prime is 268191899. The reversal of 268191893 is 398191862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 233417284 + 34774609 = 15278^2 + 5897^2 .

It is a cyclic number.

It is not a de Polignac number, because 268191893 - 2⁴ = 268191877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268191899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134095946 + 134095947.

It is an arithmetic number, because the mean of its divisors is an integer number (134095947).

Almost surely, 2^268191893 is an apocalyptic number.

It is an amenable number.

268191893 is a deficient number, since it is larger than the sum of its proper divisors (1).

268191893 is an equidigital number, since it uses as much as digits as its factorization.

268191893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 47.

The square root of 268191893 is about 16376.5653602946. The cubic root of 268191893 is about 644.8844157206.

The spelling of 268191893 in words is "two hundred sixty-eight million, one hundred ninety-one thousand, eight hundred ninety-three".