1266204253 has 4 divisors (see below), whose sum is σ = 1270249948. Its totient is φ = 1262158560.

The previous prime is 1266204241. The next prime is 1266204263. The reversal of 1266204253 is 3524026621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 202009369 + 1064194884 = 14213^2 + 32622^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1266204253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266204223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2022378 + ... + 2023003.

It is an arithmetic number, because the mean of its divisors is an integer number (317562487).

Almost surely, 2^1266204253 is an apocalyptic number.

It is an amenable number.

1266204253 is a deficient number, since it is larger than the sum of its proper divisors (4045695).

1266204253 is an equidigital number, since it uses as much as digits as its factorization.

1266204253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4045694.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 1266204253 is about 35583.7638959119. The cubic root of 1266204253 is about 1081.8521752554.

The spelling of 1266204253 in words is "one billion, two hundred sixty-six million, two hundred four thousand, two hundred fifty-three".