1135661873 has 4 divisors (see below), whose sum is σ = 1135771428. Its totient is φ = 1135552320.

The previous prime is 1135661867. The next prime is 1135661971. The reversal of 1135661873 is 3781665311.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3781665311 = 5881 ⋅643031.

It can be written as a sum of positive squares in 2 ways, for example, as 721620769 + 414041104 = 26863^2 + 20348^2 .

It is a cyclic number.

It is not a de Polignac number, because 1135661873 - 2⁸ = 1135661617 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1135661873.

It is not an unprimeable number, because it can be changed into a prime (1135661573) 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, 37388 + ... + 60573.

It is an arithmetic number, because the mean of its divisors is an integer number (283942857).

Almost surely, 2^1135661873 is an apocalyptic number.

It is an amenable number.

1135661873 is a deficient number, since it is larger than the sum of its proper divisors (109555).

1135661873 is an equidigital number, since it uses as much as digits as its factorization.

1135661873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109554.

The product of its digits is 90720, while the sum is 41.

The square root of 1135661873 is about 33699.5826828761. The cubic root of 1135661873 is about 1043.3171553006.

The spelling of 1135661873 in words is "one billion, one hundred thirty-five million, six hundred sixty-one thousand, eight hundred seventy-three".