1125665509 has 8 divisors (see below), whose sum is σ = 1130177792. Its totient is φ = 1121163120.

The previous prime is 1125665483. The next prime is 1125665539. The reversal of 1125665509 is 9055665211.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1125665509 - 2¹³ = 1125657317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1125665539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290227 + ... + 294079.

It is an arithmetic number, because the mean of its divisors is an integer number (141272224).

Almost surely, 2^1125665509 is an apocalyptic number.

It is an amenable number.

1125665509 is a deficient number, since it is larger than the sum of its proper divisors (4512283).

1125665509 is an equidigital number, since it uses as much as digits as its factorization.

1125665509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4947.

The product of its (nonzero) digits is 81000, while the sum is 40.

The square root of 1125665509 is about 33550.9390181557. The cubic root of 1125665509 is about 1040.2469547296.

The spelling of 1125665509 in words is "one billion, one hundred twenty-five million, six hundred sixty-five thousand, five hundred nine".