1265810133 has 32 divisors (see below), whose sum is σ = 1966961920. Its totient is φ = 709171200.

The previous prime is 1265810113. The next prime is 1265810137. The reversal of 1265810133 is 3310185621.

It is not a de Polignac number, because 1265810133 - 2⁶ = 1265810069 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1265810133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265810137) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 219183 + ... + 224883.

It is an arithmetic number, because the mean of its divisors is an integer number (61467560).

Almost surely, 2^1265810133 is an apocalyptic number.

It is an amenable number.

1265810133 is a deficient number, since it is larger than the sum of its proper divisors (701151787).

1265810133 is a wasteful number, since it uses less digits than its factorization.

1265810133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5917.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 1265810133 is about 35578.2255459712. The cubic root of 1265810133 is about 1081.7399174780.

Adding to 1265810133 its reverse (3310185621), we get a palindrome (4575995754).

It can be divided in two parts, 12658 and 10133, that added together give a triangular number (22791 = T₂₁₃).

The spelling of 1265810133 in words is "one billion, two hundred sixty-five million, eight hundred ten thousand, one hundred thirty-three".