1131539976 has 128 divisors (see below), whose sum is σ = 3680006400. Its totient is φ = 315394560.

The previous prime is 1131539971. The next prime is 1131539987. The reversal of 1131539976 is 6799351311.

It is a happy number.

1131539976 is a `hidden beast` number, since 11 + 31 + 539 + 9 + 76 = 666.

It is not an unprimeable number, because it can be changed into a prime (1131539971) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52866 + ... + 71118.

It is an arithmetic number, because the mean of its divisors is an integer number (28750050).

Almost surely, 2^1131539976 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1131539976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1840003200).

1131539976 is an abundant number, since it is smaller than the sum of its proper divisors (2548466424).

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

1131539976 is a wasteful number, since it uses less digits than its factorization.

1131539976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18316 (or 18306 counting only the distinct ones).

The product of its digits is 153090, while the sum is 45.

The square root of 1131539976 is about 33638.3705907406. The cubic root of 1131539976 is about 1042.0533814875.

The spelling of 1131539976 in words is "one billion, one hundred thirty-one million, five hundred thirty-nine thousand, nine hundred seventy-six".