1131520356 has 18 divisors (see below), whose sum is σ = 2860232102. Its totient is φ = 377173440.

The previous prime is 1131520339. The next prime is 1131520381. The reversal of 1131520356 is 6530251311.

1131520356 is a `hidden beast` number, since 1 + 131 + 520 + 3 + 5 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 793548900 + 337971456 = 28170^2 + 18384^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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 5 ways as a sum of consecutive naturals, for example, 15715525 + ... + 15715596.

Almost surely, 2^1131520356 is an apocalyptic number.

It is an amenable number.

1131520356 is an abundant number, since it is smaller than the sum of its proper divisors (1728711746).

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

1131520356 is a wasteful number, since it uses less digits than its factorization.

1131520356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31431131 (or 31431126 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 1131520356 is about 33638.0789582283. The cubic root of 1131520356 is about 1042.0473586614.

Adding to 1131520356 its reverse (6530251311), we get a palindrome (7661771667).

The spelling of 1131520356 in words is "one billion, one hundred thirty-one million, five hundred twenty thousand, three hundred fifty-six".