31121311131 has 16 divisors (see below), whose sum is σ = 46112858400. Its totient is φ = 20744295264.

The previous prime is 31121311061. The next prime is 31121311183. The reversal of 31121311131 is 13111312113.

31121311131 is a `hidden beast` number, since 311 + 213 + 11 + 131 = 666.

It is not a de Polignac number, because 31121311131 - 2¹³ = 31121302939 is a prime.

It is a super-2 number, since 2×31121311131² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31121311531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92365 + ... + 266033.

It is an arithmetic number, because the mean of its divisors is an integer number (2882053650).

Almost surely, 2^31121311131 is an apocalyptic number.

31121311131 is a deficient number, since it is larger than the sum of its proper divisors (14991547269).

31121311131 is a wasteful number, since it uses less digits than its factorization.

31121311131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180315 (or 180309 counting only the distinct ones).

The product of its digits is 54, while the sum is 18.

Adding to 31121311131 its reverse (13111312113), we get a palindrome (44232623244).

The spelling of 31121311131 in words is "thirty-one billion, one hundred twenty-one million, three hundred eleven thousand, one hundred thirty-one".