31231120121131 has 16 divisors (see below), whose sum is σ = 35778663442368. Its totient is φ = 26705093184000.

The previous prime is 31231120121129. The next prime is 31231120121161. The reversal of 31231120121131 is 13112102113213.

It is not a de Polignac number, because 31231120121131 - 2¹ = 31231120121129 is a prime.

It is a super-3 number, since 3×31231120121131³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (31231120121101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12404751 + ... + 14708503.

It is an arithmetic number, because the mean of its divisors is an integer number (2236166465148).

Almost surely, 2^{31231120121131} is an apocalyptic number.

31231120121131 is a deficient number, since it is larger than the sum of its proper divisors (4547543321237).

31231120121131 is a wasteful number, since it uses less digits than its factorization.

31231120121131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2308422.

The product of its (nonzero) digits is 216, while the sum is 22.

Adding to 31231120121131 its reverse (13112102113213), we get a palindrome (44343222234344).

The spelling of 31231120121131 in words is "thirty-one trillion, two hundred thirty-one billion, one hundred twenty million, one hundred twenty-one thousand, one hundred thirty-one".