1125722661 has 8 divisors (see below), whose sum is σ = 1715386944. Its totient is φ = 643270080.

The previous prime is 1125722651. The next prime is 1125722681. The reversal of 1125722661 is 1662275211.

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

It is not a de Polignac number, because 1125722661 - 2⁵ = 1125722629 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1125722651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26802900 + ... + 26802941.

It is an arithmetic number, because the mean of its divisors is an integer number (214423368).

Almost surely, 2^1125722661 is an apocalyptic number.

It is an amenable number.

1125722661 is a deficient number, since it is larger than the sum of its proper divisors (589664283).

1125722661 is an equidigital number, since it uses as much as digits as its factorization.

1125722661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53605851.

The product of its digits is 10080, while the sum is 33.

The square root of 1125722661 is about 33551.7907271728. The cubic root of 1125722661 is about 1040.2645594820.

Adding to 1125722661 its reverse (1662275211), we get a palindrome (2787997872).

The spelling of 1125722661 in words is "one billion, one hundred twenty-five million, seven hundred twenty-two thousand, six hundred sixty-one".