11387531013 has 4 divisors (see below), whose sum is σ = 15183374688. Its totient is φ = 7591687340.

The previous prime is 11387531009. The next prime is 11387531021. The reversal of 11387531013 is 31013578311.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11387531013 - 2² = 11387531009 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11387531083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1897921833 + ... + 1897921838.

It is an arithmetic number, because the mean of its divisors is an integer number (3795843672).

Almost surely, 2^11387531013 is an apocalyptic number.

It is an amenable number.

11387531013 is a deficient number, since it is larger than the sum of its proper divisors (3795843675).

11387531013 is an equidigital number, since it uses as much as digits as its factorization.

11387531013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3795843674.

The product of its (nonzero) digits is 7560, while the sum is 33.

The spelling of 11387531013 in words is "eleven billion, three hundred eighty-seven million, five hundred thirty-one thousand, thirteen".