268145209 has 4 divisors (see below), whose sum is σ = 268764916. Its totient is φ = 267525504.

The previous prime is 268145191. The next prime is 268145219. The reversal of 268145209 is 902541862.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 902541862 = 2 ⋅451270931.

It can be written as a sum of positive squares in 2 ways, for example, as 13838400 + 254306809 = 3720^2 + 15947^2 .

It is a cyclic number.

It is not a de Polignac number, because 268145209 - 2¹⁹ = 267620921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (268145219) 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, 309204 + ... + 310069.

It is an arithmetic number, because the mean of its divisors is an integer number (67191229).

Almost surely, 2^268145209 is an apocalyptic number.

It is an amenable number.

268145209 is a deficient number, since it is larger than the sum of its proper divisors (619707).

268145209 is an equidigital number, since it uses as much as digits as its factorization.

268145209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619706.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 268145209 is about 16375.1399688674. The cubic root of 268145209 is about 644.8469953363.

It can be divided in two parts, 26814 and 5209, that added together give a palindrome (32023).

The spelling of 268145209 in words is "two hundred sixty-eight million, one hundred forty-five thousand, two hundred nine".