31231120313131 has 2 divisors, whose sum is σ = 31231120313132. Its totient is φ = 31231120313130.

The previous prime is 31231120313111. The next prime is 31231120313137. The reversal of 31231120313131 is 13131302113213.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31231120313131 - 2²⁵ = 31231086758699 is a prime.

It is a super-3 number, since 3×31231120313131³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 31231120313096 and 31231120313105.

It is not a weakly prime, because it can be changed into another prime (31231120313137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15615560156565 + 15615560156566.

It is an arithmetic number, because the mean of its divisors is an integer number (15615560156566).

Almost surely, 2^{31231120313131} is an apocalyptic number.

31231120313131 is a deficient number, since it is larger than the sum of its proper divisors (1).

31231120313131 is an equidigital number, since it uses as much as digits as its factorization.

31231120313131 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 31231120313131 its reverse (13131302113213), we get a palindrome (44362422426344).

The spelling of 31231120313131 in words is "thirty-one trillion, two hundred thirty-one billion, one hundred twenty million, three hundred thirteen thousand, one hundred thirty-one".