1265488123 has 4 divisors (see below), whose sum is σ = 1281507040. Its totient is φ = 1249469208.

The previous prime is 1265488111. The next prime is 1265488139. The reversal of 1265488123 is 3218845621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3218845621 = 61 ⋅52767961.

It is a cyclic number.

It is not a de Polignac number, because 1265488123 - 2²⁵ = 1231933691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1265488183) 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, 8009340 + ... + 8009497.

It is an arithmetic number, because the mean of its divisors is an integer number (320376760).

Almost surely, 2^1265488123 is an apocalyptic number.

1265488123 is a deficient number, since it is larger than the sum of its proper divisors (16018917).

1265488123 is an equidigital number, since it uses as much as digits as its factorization.

1265488123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16018916.

The product of its digits is 92160, while the sum is 40.

The square root of 1265488123 is about 35573.6998778592. The cubic root of 1265488123 is about 1081.6481815999.

The spelling of 1265488123 in words is "one billion, two hundred sixty-five million, four hundred eighty-eight thousand, one hundred twenty-three".