31505500113213 has 8 divisors (see below), whose sum is σ = 48008381124928. Its totient is φ = 18003142921824.

The previous prime is 31505500113209. The next prime is 31505500113229. The reversal of 31505500113213 is 31231100550513.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31505500113213 - 2² = 31505500113209 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31505500113233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 750130955056 + ... + 750130955097.

It is an arithmetic number, because the mean of its divisors is an integer number (6001047640616).

Almost surely, 2^{31505500113213} is an apocalyptic number.

It is an amenable number.

31505500113213 is a deficient number, since it is larger than the sum of its proper divisors (16502881011715).

31505500113213 is a wasteful number, since it uses less digits than its factorization.

31505500113213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500261910163.

The product of its (nonzero) digits is 6750, while the sum is 30.

Adding to 31505500113213 its reverse (31231100550513), we get a palindrome (62736600663726).

The spelling of 31505500113213 in words is "thirty-one trillion, five hundred five billion, five hundred million, one hundred thirteen thousand, two hundred thirteen".