1131559956 has 90 divisors (see below), whose sum is σ = 3002030570. Its totient is φ = 371638368.

The previous prime is 1131559939. The next prime is 1131559963. The reversal of 1131559956 is 6599551311.

1131559956 is a `hidden beast` number, since 1 + 1 + 3 + 1 + 5 + 599 + 56 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1038128400 + 93431556 = 32220^2 + 9666^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 6321475 + ... + 6321653.

Almost surely, 2^1131559956 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 1131559956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1501015285).

1131559956 is an abundant number, since it is smaller than the sum of its proper divisors (1870470614).

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

1131559956 is a wasteful number, since it uses less digits than its factorization.

1131559956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483 (or 293 counting only the distinct ones).

The product of its digits is 182250, while the sum is 45.

The square root of 1131559956 is about 33638.6675717098. The cubic root of 1131559956 is about 1042.0595147526.

The spelling of 1131559956 in words is "one billion, one hundred thirty-one million, five hundred fifty-nine thousand, nine hundred fifty-six".