31331320121131 has 2 divisors, whose sum is σ = 31331320121132. Its totient is φ = 31331320121130.

The previous prime is 31331320121047. The next prime is 31331320121141. The reversal of 31331320121131 is 13112102313313.

It is a strong prime.

It is an emirp because it is prime and its reverse (13112102313313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31331320121131 - 2¹⁷ = 31331319990059 is a prime.

It is a super-2 number, since 2×31331320121131² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31331320121096 and 31331320121105.

It is not a weakly prime, because it can be changed into another prime (31331320121141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15665660060565 + 15665660060566.

It is an arithmetic number, because the mean of its divisors is an integer number (15665660060566).

Almost surely, 2^{31331320121131} is an apocalyptic number.

31331320121131 is a deficient number, since it is larger than the sum of its proper divisors (1).

31331320121131 is an equidigital number, since it uses as much as digits as its factorization.

31331320121131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 25.

Adding to 31331320121131 its reverse (13112102313313), we get a palindrome (44443422434444).

The spelling of 31331320121131 in words is "thirty-one trillion, three hundred thirty-one billion, three hundred twenty million, one hundred twenty-one thousand, one hundred thirty-one".