31105323213 has 16 divisors (see below), whose sum is σ = 42818353152. Its totient is φ = 20064798000.

The previous prime is 31105323209. The next prime is 31105323253. The reversal of 31105323213 is 31232350113.

It is not a de Polignac number, because 31105323213 - 2² = 31105323209 is a prime.

It is a super-2 number, since 2×31105323213² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31105323203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 666658 + ... + 711788.

It is an arithmetic number, because the mean of its divisors is an integer number (2676147072).

Almost surely, 2^31105323213 is an apocalyptic number.

It is an amenable number.

31105323213 is a deficient number, since it is larger than the sum of its proper divisors (11713029939).

31105323213 is a wasteful number, since it uses less digits than its factorization.

31105323213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52576.

The product of its (nonzero) digits is 1620, while the sum is 24.

Adding to 31105323213 its reverse (31232350113), we get a palindrome (62337673326).

The spelling of 31105323213 in words is "thirty-one billion, one hundred five million, three hundred twenty-three thousand, two hundred thirteen".