1125053509 has 4 divisors (see below), whose sum is σ = 1130098816. Its totient is φ = 1120008204.

The previous prime is 1125053507. The next prime is 1125053537. The reversal of 1125053509 is 9053505211.

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: 9053505211 = 39727 ⋅227893.

It is a cyclic number.

It is not a de Polignac number, because 1125053509 - 2¹ = 1125053507 is a prime.

It is a super-2 number, since 2×1125053509² = 2531490796226426162, 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 (1125053507) 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, 2522319 + ... + 2522764.

It is an arithmetic number, because the mean of its divisors is an integer number (282524704).

Almost surely, 2^1125053509 is an apocalyptic number.

It is an amenable number.

1125053509 is a deficient number, since it is larger than the sum of its proper divisors (5045307).

1125053509 is an equidigital number, since it uses as much as digits as its factorization.

1125053509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5045306.

The product of its (nonzero) digits is 6750, while the sum is 31.

The square root of 1125053509 is about 33541.8173180882. The cubic root of 1125053509 is about 1040.0584006283.

The spelling of 1125053509 in words is "one billion, one hundred twenty-five million, fifty-three thousand, five hundred nine".