1125531013 has 4 divisors (see below), whose sum is σ = 1174467168. Its totient is φ = 1076594860.

The previous prime is 1125530999. The next prime is 1125531049. The reversal of 1125531013 is 3101355211.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1125531013 is a prime.

It is a super-2 number, since 2×1125531013² = 2533640122449612338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1125531413) 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, 24468043 + ... + 24468088.

It is an arithmetic number, because the mean of its divisors is an integer number (293616792).

Almost surely, 2^1125531013 is an apocalyptic number.

It is an amenable number.

1125531013 is a deficient number, since it is larger than the sum of its proper divisors (48936155).

1125531013 is an equidigital number, since it uses as much as digits as its factorization.

1125531013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48936154.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 1125531013 is about 33548.9346030541. The cubic root of 1125531013 is about 1040.2055230533.

Adding to 1125531013 its reverse (3101355211), we get a palindrome (4226886224).

The spelling of 1125531013 in words is "one billion, one hundred twenty-five million, five hundred thirty-one thousand, thirteen".