11531155847 has 4 divisors (see below), whose sum is σ = 11689116960. Its totient is φ = 11373194736.

The previous prime is 11531155843. The next prime is 11531155849. The reversal of 11531155847 is 74855113511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74855113511 = 31 ⋅2414681081.

It is a cyclic number.

It is not a de Polignac number, because 11531155847 - 2² = 11531155843 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 (11531155843) 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, 78980447 + ... + 78980592.

It is an arithmetic number, because the mean of its divisors is an integer number (2922279240).

Almost surely, 2^11531155847 is an apocalyptic number.

11531155847 is a deficient number, since it is larger than the sum of its proper divisors (157961113).

11531155847 is an equidigital number, since it uses as much as digits as its factorization.

11531155847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157961112.

The product of its digits is 84000, while the sum is 41.

The spelling of 11531155847 in words is "eleven billion, five hundred thirty-one million, one hundred fifty-five thousand, eight hundred forty-seven".