1131481885 has 4 divisors (see below), whose sum is σ = 1357778268. Its totient is φ = 905185504.

The previous prime is 1131481877. The next prime is 1131481907. The reversal of 1131481885 is 5881841311.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 638775076 + 492706809 = 25274^2 + 22197^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131481885 - 2³ = 1131481877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113148184 + ... + 113148193.

It is an arithmetic number, because the mean of its divisors is an integer number (339444567).

Almost surely, 2^1131481885 is an apocalyptic number.

It is an amenable number.

1131481885 is a deficient number, since it is larger than the sum of its proper divisors (226296383).

1131481885 is an equidigital number, since it uses as much as digits as its factorization.

1131481885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226296382.

The product of its digits is 30720, while the sum is 40.

The square root of 1131481885 is about 33637.5071163129. The cubic root of 1131481885 is about 1042.0355488699.

The spelling of 1131481885 in words is "one billion, one hundred thirty-one million, four hundred eighty-one thousand, eight hundred eighty-five".