1011265123 has 12 divisors (see below), whose sum is σ = 1138672584. Its totient is φ = 896904800.

The previous prime is 1011265117. The next prime is 1011265159. The reversal of 1011265123 is 3215621101.

It is a happy number.

It is not a de Polignac number, because 1011265123 - 2⁵ = 1011265091 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011265094 and 1011265103.

It is not an unprimeable number, because it can be changed into a prime (1011265163) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96961 + ... + 106882.

It is an arithmetic number, because the mean of its divisors is an integer number (94889382).

Almost surely, 2^1011265123 is an apocalyptic number.

1011265123 is a deficient number, since it is larger than the sum of its proper divisors (127407461).

1011265123 is a wasteful number, since it uses less digits than its factorization.

1011265123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203906 (or 203895 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 1011265123 is about 31800.3950132699. The cubic root of 1011265123 is about 1003.7410282553.

Adding to 1011265123 its reverse (3215621101), we get a palindrome (4226886224).

The spelling of 1011265123 in words is "one billion, eleven million, two hundred sixty-five thousand, one hundred twenty-three".