268521403 has 2 divisors, whose sum is σ = 268521404. Its totient is φ = 268521402.

The previous prime is 268521377. The next prime is 268521413. The reversal of 268521403 is 304125862.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 268521403 - 2⁵ = 268521371 is a prime.

It is not a weakly prime, because it can be changed into another prime (268521413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134260701 + 134260702.

It is an arithmetic number, because the mean of its divisors is an integer number (134260702).

Almost surely, 2^268521403 is an apocalyptic number.

268521403 is a deficient number, since it is larger than the sum of its proper divisors (1).

268521403 is an equidigital number, since it uses as much as digits as its factorization.

268521403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 268521403 is about 16386.6226843728. The cubic root of 268521403 is about 645.1484168607.

The spelling of 268521403 in words is "two hundred sixty-eight million, five hundred twenty-one thousand, four hundred three".