11131031331 has 24 divisors (see below), whose sum is σ = 18556977504. Its totient is φ = 6297609600.

The previous prime is 11131031321. The next prime is 11131031339. The reversal of 11131031331 is 13313013111.

11131031331 is a `hidden beast` number, since 1 + 11 + 310 + 313 + 31 = 666.

It is not a de Polignac number, because 11131031331 - 2⁶ = 11131031267 is a prime.

It is a super-2 number, since 2×11131031331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11131031339) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 868306 + ... + 881031.

It is an arithmetic number, because the mean of its divisors is an integer number (773207396).

Almost surely, 2^11131031331 is an apocalyptic number.

11131031331 is a deficient number, since it is larger than the sum of its proper divisors (7425946173).

11131031331 is a wasteful number, since it uses less digits than its factorization.

11131031331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1749451 (or 1749448 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 18.

Adding to 11131031331 its reverse (13313013111), we get a palindrome (24444044442).

The spelling of 11131031331 in words is "eleven billion, one hundred thirty-one million, thirty-one thousand, three hundred thirty-one".