1131521013 has 24 divisors (see below), whose sum is σ = 1918395648. Its totient is φ = 629106912.

The previous prime is 1131520997. The next prime is 1131521047. The reversal of 1131521013 is 3101251311.

1131521013 is a `hidden beast` number, since 1 + 131 + 521 + 0 + 13 = 666.

It is not a de Polignac number, because 1131521013 - 2⁴ = 1131520997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131521213) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 240381 + ... + 245042.

It is an arithmetic number, because the mean of its divisors is an integer number (79933152).

Almost surely, 2^1131521013 is an apocalyptic number.

It is an amenable number.

1131521013 is a deficient number, since it is larger than the sum of its proper divisors (786874635).

1131521013 is a wasteful number, since it uses less digits than its factorization.

1131521013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485473 (or 485470 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 1131521013 is about 33638.0887239451. The cubic root of 1131521013 is about 1042.0475603443.

Adding to 1131521013 its reverse (3101251311), we get a palindrome (4232772324).

The spelling of 1131521013 in words is "one billion, one hundred thirty-one million, five hundred twenty-one thousand, thirteen".