31211133313 has 6 divisors (see below), whose sum is σ = 32940282354. Its totient is φ = 29568441744.

The previous prime is 31211133311. The next prime is 31211133329. The reversal of 31211133313 is 31333111213.

It can be written as a sum of positive squares in only one way, i.e., 24196735809 + 7014397504 = 155553^2 + 83752^2 .

It is not a de Polignac number, because 31211133313 - 2¹ = 31211133311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31211133311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43228356 + ... + 43229077.

It is an arithmetic number, because the mean of its divisors is an integer number (5490047059).

Almost surely, 2^31211133313 is an apocalyptic number.

It is an amenable number.

31211133313 is a deficient number, since it is larger than the sum of its proper divisors (1729149041).

31211133313 is an equidigital number, since it uses as much as digits as its factorization.

31211133313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86457471 (or 86457452 counting only the distinct ones).

The product of its digits is 486, while the sum is 22.

Adding to 31211133313 its reverse (31333111213), we get a palindrome (62544244526).

The spelling of 31211133313 in words is "thirty-one billion, two hundred eleven million, one hundred thirty-three thousand, three hundred thirteen".