11531097819 has 8 divisors (see below), whose sum is σ = 17083107920. Its totient is φ = 7687398528.

The previous prime is 11531097811. The next prime is 11531097871. The reversal of 11531097819 is 91879013511.

It is a happy number.

11531097819 is a `hidden beast` number, since 11 + 531 + 0 + 97 + 8 + 19 = 666.

It is not a de Polignac number, because 11531097819 - 2³ = 11531097811 is a prime.

It is a super-2 number, since 2×11531097819² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11531097811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213538822 + ... + 213538875.

It is an arithmetic number, because the mean of its divisors is an integer number (2135388490).

Almost surely, 2^11531097819 is an apocalyptic number.

11531097819 is a deficient number, since it is larger than the sum of its proper divisors (5552010101).

11531097819 is an equidigital number, since it uses as much as digits as its factorization.

11531097819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427077706 (or 427077700 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 45.

The spelling of 11531097819 in words is "eleven billion, five hundred thirty-one million, ninety-seven thousand, eight hundred nineteen".