268220591 has 2 divisors, whose sum is σ = 268220592. Its totient is φ = 268220590.

The previous prime is 268220573. The next prime is 268220597. The reversal of 268220591 is 195022862.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 268220591 - 2¹⁴ = 268204207 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268220597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134110295 + 134110296.

It is an arithmetic number, because the mean of its divisors is an integer number (134110296).

Almost surely, 2^268220591 is an apocalyptic number.

268220591 is a deficient number, since it is larger than the sum of its proper divisors (1).

268220591 is an equidigital number, since it uses as much as digits as its factorization.

268220591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 268220591 is about 16377.4415279066. The cubic root of 268220591 is about 644.9074169539.

The spelling of 268220591 in words is "two hundred sixty-eight million, two hundred twenty thousand, five hundred ninety-one".