268513621 has 2 divisors, whose sum is σ = 268513622. Its totient is φ = 268513620.

The previous prime is 268513613. The next prime is 268513669. The reversal of 268513621 is 126315862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 266048721 + 2464900 = 16311^2 + 1570^2 .

It is a cyclic number.

It is not a de Polignac number, because 268513621 - 2³ = 268513613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268513601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134256810 + 134256811.

It is an arithmetic number, because the mean of its divisors is an integer number (134256811).

Almost surely, 2^268513621 is an apocalyptic number.

It is an amenable number.

268513621 is a deficient number, since it is larger than the sum of its proper divisors (1).

268513621 is an equidigital number, since it uses as much as digits as its factorization.

268513621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 34.

The square root of 268513621 is about 16386.3852328694. The cubic root of 268513621 is about 645.1421844668.

The spelling of 268513621 in words is "two hundred sixty-eight million, five hundred thirteen thousand, six hundred twenty-one".