31331021123 has 2 divisors, whose sum is σ = 31331021124. Its totient is φ = 31331021122.

The previous prime is 31331021087. The next prime is 31331021159. The reversal of 31331021123 is 32112013313.

It is a balanced prime because it is at equal distance from previous prime (31331021087) and next prime (31331021159).

It is an emirp because it is prime and its reverse (32112013313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31331021123 - 2¹⁶ = 31330955587 is a prime.

It is a super-2 number, since 2×31331021123² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31331021095 and 31331021104.

It is not a weakly prime, because it can be changed into another prime (31331021723) 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 as a sum of consecutive naturals, namely, 15665510561 + 15665510562.

It is an arithmetic number, because the mean of its divisors is an integer number (15665510562).

Almost surely, 2^31331021123 is an apocalyptic number.

31331021123 is a deficient number, since it is larger than the sum of its proper divisors (1).

31331021123 is an equidigital number, since it uses as much as digits as its factorization.

31331021123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31331021123 its reverse (32112013313), we get a palindrome (63443034436).

It can be divided in two parts, 313310 and 21123, that added together give a palindrome (334433).

The spelling of 31331021123 in words is "thirty-one billion, three hundred thirty-one million, twenty-one thousand, one hundred twenty-three".