268505621 has 2 divisors, whose sum is σ = 268505622. Its totient is φ = 268505620.

The previous prime is 268505617. The next prime is 268505623. The reversal of 268505621 is 126505862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146071396 + 122434225 = 12086^2 + 11065^2 .

It is a cyclic number.

It is not a de Polignac number, because 268505621 - 2² = 268505617 is a prime.

Together with 268505623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268505623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134252810 + 134252811.

It is an arithmetic number, because the mean of its divisors is an integer number (134252811).

Almost surely, 2^268505621 is an apocalyptic number.

It is an amenable number.

268505621 is a deficient number, since it is larger than the sum of its proper divisors (1).

268505621 is an equidigital number, since it uses as much as digits as its factorization.

268505621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 268505621 is about 16386.1411259637. The cubic root of 268505621 is about 645.1357773570.

The spelling of 268505621 in words is "two hundred sixty-eight million, five hundred five thousand, six hundred twenty-one".