11531699438381 has 4 divisors (see below), whose sum is σ = 11564932001952. Its totient is φ = 11498466874812.

The previous prime is 11531699438321. The next prime is 11531699438407. The reversal of 11531699438381 is 18383499613511.

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 11531699438381 - 2⁶ = 11531699438317 is a prime.

It is a super-2 number, since 2×11531699438381² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11531699438321) 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, 16616281265 + ... + 16616281958.

It is an arithmetic number, because the mean of its divisors is an integer number (2891233000488).

Almost surely, 2^{11531699438381} is an apocalyptic number.

It is an amenable number.

11531699438381 is a deficient number, since it is larger than the sum of its proper divisors (33232563571).

11531699438381 is an equidigital number, since it uses as much as digits as its factorization.

11531699438381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33232563570.

The product of its digits is 16796160, while the sum is 62.

The spelling of 11531699438381 in words is "eleven trillion, five hundred thirty-one billion, six hundred ninety-nine million, four hundred thirty-eight thousand, three hundred eighty-one".