1265126253 has 8 divisors (see below), whose sum is σ = 1697579808. Its totient is φ = 838045104.

The previous prime is 1265126243. The next prime is 1265126257. The reversal of 1265126253 is 3526215621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1265126253 - 2³⁰ = 191384429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265126257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1342551 + ... + 1343492.

It is an arithmetic number, because the mean of its divisors is an integer number (212197476).

Almost surely, 2^1265126253 is an apocalyptic number.

It is an amenable number.

1265126253 is a deficient number, since it is larger than the sum of its proper divisors (432453555).

1265126253 is a wasteful number, since it uses less digits than its factorization.

1265126253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2686203.

The product of its digits is 21600, while the sum is 33.

The square root of 1265126253 is about 35568.6133128634. The cubic root of 1265126253 is about 1081.5450716259.

The spelling of 1265126253 in words is "one billion, two hundred sixty-five million, one hundred twenty-six thousand, two hundred fifty-three".