1131550021 has 48 divisors (see below), whose sum is σ = 1433094912. Its totient is φ = 872847360.

The previous prime is 1131550009. The next prime is 1131550081. The reversal of 1131550021 is 1200551311.

It is not a de Polignac number, because 1131550021 - 2⁷ = 1131549893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131550081) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 10013661 + ... + 10013773.

It is an arithmetic number, because the mean of its divisors is an integer number (29856144).

Almost surely, 2^1131550021 is an apocalyptic number.

It is an amenable number.

1131550021 is a deficient number, since it is larger than the sum of its proper divisors (301544891).

1131550021 is a wasteful number, since it uses less digits than its factorization.

1131550021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262 (or 221 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 19.

The square root of 1131550021 is about 33638.5198990681. The cubic root of 1131550021 is about 1042.0564650124.

The spelling of 1131550021 in words is "one billion, one hundred thirty-one million, five hundred fifty thousand, twenty-one".