268969821 has 4 divisors (see below), whose sum is σ = 358626432. Its totient is φ = 179313212.

The previous prime is 268969783. The next prime is 268969853. The reversal of 268969821 is 128969862.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 268969821 - 2¹⁰ = 268968797 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (268969891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44828301 + ... + 44828306.

It is an arithmetic number, because the mean of its divisors is an integer number (89656608).

Almost surely, 2^268969821 is an apocalyptic number.

It is an amenable number.

268969821 is a deficient number, since it is larger than the sum of its proper divisors (89656611).

268969821 is an equidigital number, since it uses as much as digits as its factorization.

268969821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89656610.

The product of its digits is 746496, while the sum is 51.

The square root of 268969821 is about 16400.2994179984. The cubic root of 268969821 is about 645.5073395534.

The spelling of 268969821 in words is "two hundred sixty-eight million, nine hundred sixty-nine thousand, eight hundred twenty-one".