11918578831 has 8 divisors (see below), whose sum is σ = 12063438000. Its totient is φ = 11774246400.

The previous prime is 11918578829. The next prime is 11918578853. The reversal of 11918578831 is 13887581911.

11918578831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11918578831 - 2¹ = 11918578829 is a prime.

It is a super-2 number, since 2×11918578831² (a number of 21 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 (11918578631) 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 7 ways as a sum of consecutive naturals, for example, 86061 + ... + 176758.

It is an arithmetic number, because the mean of its divisors is an integer number (1507929750).

Almost surely, 2^11918578831 is an apocalyptic number.

11918578831 is a deficient number, since it is larger than the sum of its proper divisors (144859169).

11918578831 is a wasteful number, since it uses less digits than its factorization.

11918578831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263369.

The product of its digits is 483840, while the sum is 52.

The spelling of 11918578831 in words is "eleven billion, nine hundred eighteen million, five hundred seventy-eight thousand, eight hundred thirty-one".