268213591 has 2 divisors, whose sum is σ = 268213592. Its totient is φ = 268213590.

The previous prime is 268213579. The next prime is 268213601. The reversal of 268213591 is 195312862.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 268213591 - 2¹⁵ = 268180823 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 268213591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268213501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134106795 + 134106796.

It is an arithmetic number, because the mean of its divisors is an integer number (134106796).

Almost surely, 2^268213591 is an apocalyptic number.

268213591 is a deficient number, since it is larger than the sum of its proper divisors (1).

268213591 is an equidigital number, since it uses as much as digits as its factorization.

268213591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 37.

The square root of 268213591 is about 16377.2278179184. The cubic root of 268213591 is about 644.9018066573.

The spelling of 268213591 in words is "two hundred sixty-eight million, two hundred thirteen thousand, five hundred ninety-one".