31213210131 has 12 divisors (see below), whose sum is σ = 45100961880. Its totient is φ = 20801784960.

The previous prime is 31213210121. The next prime is 31213210141. The reversal of 31213210131 is 13101231213.

31213210131 is a `hidden beast` number, since 312 + 1 + 321 + 0 + 1 + 31 = 666.

It is an interprime number because it is at equal distance from previous prime (31213210121) and next prime (31213210141).

It is not a de Polignac number, because 31213210131 - 2⁵ = 31213210099 is a prime.

It is a super-2 number, since 2×31213210131² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31213210121) 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 11 ways as a sum of consecutive naturals, for example, 556926 + ... + 610403.

It is an arithmetic number, because the mean of its divisors is an integer number (3758413490).

Almost surely, 2^31213210131 is an apocalyptic number.

31213210131 is a deficient number, since it is larger than the sum of its proper divisors (13887751749).

31213210131 is a wasteful number, since it uses less digits than its factorization.

31213210131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1170306 (or 1170303 counting only the distinct ones).

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

Adding to 31213210131 its reverse (13101231213), we get a palindrome (44314441344).

The spelling of 31213210131 in words is "thirty-one billion, two hundred thirteen million, two hundred ten thousand, one hundred thirty-one".