31013231031205 has 4 divisors (see below), whose sum is σ = 37215877237452. Its totient is φ = 24810584824960.

The previous prime is 31013231031203. The next prime is 31013231031217. The reversal of 31013231031205 is 50213013231013.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15408969281476 + 15604261749729 = 3925426^2 + 3950223^2 .

It is not a de Polignac number, because 31013231031205 - 2¹ = 31013231031203 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31013231031205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31013231031203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3101323103116 + ... + 3101323103125.

It is an arithmetic number, because the mean of its divisors is an integer number (9303969309363).

Almost surely, 2^{31013231031205} is an apocalyptic number.

It is an amenable number.

31013231031205 is a deficient number, since it is larger than the sum of its proper divisors (6202646206247).

31013231031205 is an equidigital number, since it uses as much as digits as its factorization.

31013231031205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6202646206246.

The product of its (nonzero) digits is 1620, while the sum is 25.

Adding to 31013231031205 its reverse (50213013231013), we get a palindrome (81226244262218).

The spelling of 31013231031205 in words is "thirty-one trillion, thirteen billion, two hundred thirty-one million, thirty-one thousand, two hundred five".