1266025243 has 4 divisors (see below), whose sum is σ = 1446886000. Its totient is φ = 1085164488.

The previous prime is 1266025199. The next prime is 1266025249. The reversal of 1266025243 is 3425206621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3425206621 = 23 ⋅148922027.

It is a cyclic number.

It is not a de Polignac number, because 1266025243 - 2²⁹ = 729154331 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1266025249) 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, 90430368 + ... + 90430381.

It is an arithmetic number, because the mean of its divisors is an integer number (361721500).

Almost surely, 2^1266025243 is an apocalyptic number.

1266025243 is a deficient number, since it is larger than the sum of its proper divisors (180860757).

1266025243 is an equidigital number, since it uses as much as digits as its factorization.

1266025243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180860756.

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

The square root of 1266025243 is about 35581.2484744423. The cubic root of 1266025243 is about 1081.8011904625.

The spelling of 1266025243 in words is "one billion, two hundred sixty-six million, twenty-five thousand, two hundred forty-three".