1125520013 has 4 divisors (see below), whose sum is σ = 1126281468. Its totient is φ = 1124758560.

The previous prime is 1125520001. The next prime is 1125520027. The reversal of 1125520013 is 3100255211.

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: 3100255211 = 12539 ⋅247249.

It can be written as a sum of positive squares in 2 ways, for example, as 230493124 + 895026889 = 15182^2 + 29917^2 .

It is a cyclic number.

It is not a de Polignac number, because 1125520013 - 2²⁰ = 1124471437 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1125520093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 378506 + ... + 381467.

It is an arithmetic number, because the mean of its divisors is an integer number (281570367).

Almost surely, 2^1125520013 is an apocalyptic number.

It is an amenable number.

1125520013 is a deficient number, since it is larger than the sum of its proper divisors (761455).

1125520013 is an equidigital number, since it uses as much as digits as its factorization.

1125520013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761454.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 1125520013 is about 33548.7706630213. The cubic root of 1125520013 is about 1040.2021343423.

Adding to 1125520013 its reverse (3100255211), we get a palindrome (4225775224).

The spelling of 1125520013 in words is "one billion, one hundred twenty-five million, five hundred twenty thousand, thirteen".