31231203120205 has 32 divisors (see below), whose sum is σ = 40985564256000. Its totient is φ = 22657463700480.

The previous prime is 31231203120163. The next prime is 31231203120209. The reversal of 31231203120205 is 50202130213213.

It is not a de Polignac number, because 31231203120205 - 2⁹ = 31231203119693 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31231203120205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31231203120209) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 150955171 + ... + 151161919.

It is an arithmetic number, because the mean of its divisors is an integer number (1280798883000).

Almost surely, 2^{31231203120205} is an apocalyptic number.

It is an amenable number.

31231203120205 is a deficient number, since it is larger than the sum of its proper divisors (9754361135795).

31231203120205 is a wasteful number, since it uses less digits than its factorization.

31231203120205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213541.

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 31231203120205 its reverse (50202130213213), we get a palindrome (81433333333418).

The spelling of 31231203120205 in words is "thirty-one trillion, two hundred thirty-one billion, two hundred three million, one hundred twenty thousand, two hundred five".