1125305781 has 8 divisors (see below), whose sum is σ = 1501864320. Its totient is φ = 749475552.

The previous prime is 1125305777. The next prime is 1125305791. The reversal of 1125305781 is 1875035211.

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

It is not a de Polignac number, because 1125305781 - 2² = 1125305777 is a prime.

It is a super-2 number, since 2×1125305781² = 2532626201504039922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1125305711) 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, 178461 + ... + 184658.

It is an arithmetic number, because the mean of its divisors is an integer number (187733040).

Almost surely, 2^1125305781 is an apocalyptic number.

It is an amenable number.

1125305781 is a deficient number, since it is larger than the sum of its proper divisors (376558539).

1125305781 is a wasteful number, since it uses less digits than its factorization.

1125305781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364155.

The product of its (nonzero) digits is 8400, while the sum is 33.

The square root of 1125305781 is about 33545.5776668103. The cubic root of 1125305781 is about 1040.1361326360.

The spelling of 1125305781 in words is "one billion, one hundred twenty-five million, three hundred five thousand, seven hundred eighty-one".