31211311320313 has 4 divisors (see below), whose sum is σ = 31800203986788. Its totient is φ = 30622418653840.

The previous prime is 31211311320307. The next prime is 31211311320323. The reversal of 31211311320313 is 31302311311213.

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 8031737377024 + 23179573943289 = 2834032^2 + 4814517^2 .

It is a cyclic number.

It is not a de Polignac number, because 31211311320313 - 2¹³ = 31211311312121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31211311320323) 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, 294446333158 + ... + 294446333263.

It is an arithmetic number, because the mean of its divisors is an integer number (7950050996697).

Almost surely, 2^{31211311320313} is an apocalyptic number.

It is an amenable number.

31211311320313 is a deficient number, since it is larger than the sum of its proper divisors (588892666475).

31211311320313 is an equidigital number, since it uses as much as digits as its factorization.

31211311320313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588892666474.

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

Adding to 31211311320313 its reverse (31302311311213), we get a palindrome (62513622631526).

It can be divided in two parts, 3121131 and 1320313, that added together give a palindrome (4441444).

The spelling of 31211311320313 in words is "thirty-one trillion, two hundred eleven billion, three hundred eleven million, three hundred twenty thousand, three hundred thirteen".