31123210131 has 12 divisors (see below), whose sum is σ = 48413882608. Its totient is φ = 19152744624.

The previous prime is 31123210121. The next prime is 31123210133. The reversal of 31123210131 is 13101232113.

31123210131 is a `hidden beast` number, since 311 + 2 + 321 + 0 + 1 + 31 = 666.

It is not a de Polignac number, because 31123210131 - 2¹⁷ = 31123079059 is a prime.

It is a super-2 number, since 2×31123210131² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31123210133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 133005055 + ... + 133005288.

Almost surely, 2^31123210131 is an apocalyptic number.

31123210131 is a deficient number, since it is larger than the sum of its proper divisors (17290672477).

31123210131 is a wasteful number, since it uses less digits than its factorization.

31123210131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266010362 (or 266010359 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 31123210131 its reverse (13101232113), we get a palindrome (44224442244).

The spelling of 31123210131 in words is "thirty-one billion, one hundred twenty-three million, two hundred ten thousand, one hundred thirty-one".