1125036661 has 4 divisors (see below), whose sum is σ = 1285756192. Its totient is φ = 964317132.

The previous prime is 1125036623. The next prime is 1125036667. The reversal of 1125036661 is 1666305211.

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-1125036661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1125036667) 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, 80359755 + ... + 80359768.

It is an arithmetic number, because the mean of its divisors is an integer number (321439048).

Almost surely, 2^1125036661 is an apocalyptic number.

It is an amenable number.

1125036661 is a deficient number, since it is larger than the sum of its proper divisors (160719531).

1125036661 is an equidigital number, since it uses as much as digits as its factorization.

1125036661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160719530.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 1125036661 is about 33541.5661679654. The cubic root of 1125036661 is about 1040.0532088778.

The spelling of 1125036661 in words is "one billion, one hundred twenty-five million, thirty-six thousand, six hundred sixty-one".