1131819894 has 24 divisors (see below), whose sum is σ = 2460123432. Its totient is φ = 376066080.

The previous prime is 1131819881. The next prime is 1131819901. The reversal of 1131819894 is 4989181311.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 94812 + ... + 106079.

It is an arithmetic number, because the mean of its divisors is an integer number (102505143).

Almost surely, 2^1131819894 is an apocalyptic number.

1131819894 is an abundant number, since it is smaller than the sum of its proper divisors (1328303538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1131819894 is a wasteful number, since it uses less digits than its factorization.

1131819894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201212 (or 201209 counting only the distinct ones).

The product of its digits is 62208, while the sum is 45.

The square root of 1131819894 is about 33642.5310284467. The cubic root of 1131819894 is about 1042.1393014006.

The spelling of 1131819894 in words is "one billion, one hundred thirty-one million, eight hundred nineteen thousand, eight hundred ninety-four".