1125515513 has 4 divisors (see below), whose sum is σ = 1142314320. Its totient is φ = 1108716708.

The previous prime is 1125515509. The next prime is 1125515527. The reversal of 1125515513 is 3155155211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3155155211 = 13 ⋅242704247.

It is a cyclic number.

It is not a de Polignac number, because 1125515513 - 2² = 1125515509 is a prime.

It is a super-3 number, since 3×1125515513³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1125515563) 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, 8399303 + ... + 8399436.

It is an arithmetic number, because the mean of its divisors is an integer number (285578580).

Almost surely, 2^1125515513 is an apocalyptic number.

It is an amenable number.

1125515513 is a deficient number, since it is larger than the sum of its proper divisors (16798807).

1125515513 is an equidigital number, since it uses as much as digits as its factorization.

1125515513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16798806.

The product of its digits is 3750, while the sum is 29.

The square root of 1125515513 is about 33548.7035964134. The cubic root of 1125515513 is about 1040.2007480451.

The spelling of 1125515513 in words is "one billion, one hundred twenty-five million, five hundred fifteen thousand, five hundred thirteen".