268621009 has 4 divisors (see below), whose sum is σ = 269496304. Its totient is φ = 267745716.

The previous prime is 268621007. The next prime is 268621019. The reversal of 268621009 is 900126862.

It is a happy number.

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 268621009 - 2¹ = 268621007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (268621007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 437187 + ... + 437800.

It is an arithmetic number, because the mean of its divisors is an integer number (67374076).

Almost surely, 2^268621009 is an apocalyptic number.

It is an amenable number.

268621009 is a deficient number, since it is larger than the sum of its proper divisors (875295).

268621009 is an equidigital number, since it uses as much as digits as its factorization.

268621009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875294.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 268621009 is about 16389.6616499548. The cubic root of 268621009 is about 645.2281779877.

The spelling of 268621009 in words is "two hundred sixty-eight million, six hundred twenty-one thousand, nine".