31100043213 has 6 divisors (see below), whose sum is σ = 44922284654. Its totient is φ = 20733362136.

The previous prime is 31100043203. The next prime is 31100043223. The reversal of 31100043213 is 31234000113.

It is an interprime number because it is at equal distance from previous prime (31100043203) and next prime (31100043223).

It can be written as a sum of positive squares in only one way, i.e., 21791073924 + 9308969289 = 147618^2 + 96483^2 .

It is not a de Polignac number, because 31100043213 - 2⁸ = 31100042957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31100043203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1727780170 + ... + 1727780187.

Almost surely, 2^31100043213 is an apocalyptic number.

It is an amenable number.

31100043213 is a deficient number, since it is larger than the sum of its proper divisors (13822241441).

31100043213 is a wasteful number, since it uses less digits than its factorization.

31100043213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3455560363 (or 3455560360 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 31100043213 its reverse (31234000113), we get a palindrome (62334043326).

The spelling of 31100043213 in words is "thirty-one billion, one hundred million, forty-three thousand, two hundred thirteen".