11431081278 has 24 divisors (see below), whose sum is σ = 24962366208. Its totient is φ = 3780356832.

The previous prime is 11431081261. The next prime is 11431081289. The reversal of 11431081278 is 87218013411.

It is a super-2 number, since 2×11431081278² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2497951 + ... + 2502522.

It is an arithmetic number, because the mean of its divisors is an integer number (1040098592).

Almost surely, 2^11431081278 is an apocalyptic number.

11431081278 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

11431081278 is an abundant number, since it is smaller than the sum of its proper divisors (13531284930).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11431081278 is a wasteful number, since it uses less digits than its factorization.

11431081278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5000608 (or 5000605 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

Adding to 11431081278 its reverse (87218013411), we get a palindrome (98649094689).

The spelling of 11431081278 in words is "eleven billion, four hundred thirty-one million, eighty-one thousand, two hundred seventy-eight".