1265111053 has 4 divisors (see below), whose sum is σ = 1265406300. Its totient is φ = 1264815808.

The previous prime is 1265111017. The next prime is 1265111063. The reversal of 1265111053 is 3501115621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3501115621 = 571 ⋅6131551.

It can be written as a sum of positive squares in 2 ways, for example, as 183819364 + 1081291689 = 13558^2 + 32883^2 .

It is a cyclic number.

It is not a de Polignac number, because 1265111053 - 2²⁵ = 1231556621 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 (1265111063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141100 + ... + 149797.

It is an arithmetic number, because the mean of its divisors is an integer number (316351575).

Almost surely, 2^1265111053 is an apocalyptic number.

It is an amenable number.

1265111053 is a deficient number, since it is larger than the sum of its proper divisors (295247).

1265111053 is an equidigital number, since it uses as much as digits as its factorization.

1265111053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295246.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 1265111053 is about 35568.3996406923. The cubic root of 1265111053 is about 1081.5407401607.

Adding to 1265111053 its reverse (3501115621), we get a palindrome (4766226674).

The spelling of 1265111053 in words is "one billion, two hundred sixty-five million, one hundred eleven thousand, fifty-three".