31220131123 has 16 divisors (see below), whose sum is σ = 32747742720. Its totient is φ = 29733804576.

The previous prime is 31220131121. The next prime is 31220131127. The reversal of 31220131123 is 32113102213.

It is a cyclic number.

It is not a de Polignac number, because 31220131123 - 2¹ = 31220131121 is a prime.

It is a super-2 number, since 2×31220131123² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31220131123.

It is not an unprimeable number, because it can be changed into a prime (31220131121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 514936 + ... + 572362.

It is an arithmetic number, because the mean of its divisors is an integer number (2046733920).

Almost surely, 2^31220131123 is an apocalyptic number.

31220131123 is a deficient number, since it is larger than the sum of its proper divisors (1527611597).

31220131123 is a wasteful number, since it uses less digits than its factorization.

31220131123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57786.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31220131123 its reverse (32113102213), we get a palindrome (63333233336).

The spelling of 31220131123 in words is "thirty-one billion, two hundred twenty million, one hundred thirty-one thousand, one hundred twenty-three".