31506632213 has 4 divisors (see below), whose sum is σ = 36007579680. Its totient is φ = 27005684748.

The previous prime is 31506632203. The next prime is 31506632221. The reversal of 31506632213 is 31223660513.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31223660513 = 46681 ⋅668873.

It is not a de Polignac number, because 31506632213 - 2⁶ = 31506632149 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31506632213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31506632203) 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, 2250473723 + ... + 2250473736.

It is an arithmetic number, because the mean of its divisors is an integer number (9001894920).

Almost surely, 2^31506632213 is an apocalyptic number.

It is an amenable number.

31506632213 is a deficient number, since it is larger than the sum of its proper divisors (4500947467).

31506632213 is an equidigital number, since it uses as much as digits as its factorization.

31506632213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4500947466.

The product of its (nonzero) digits is 19440, while the sum is 32.

The spelling of 31506632213 in words is "thirty-one billion, five hundred six million, six hundred thirty-two thousand, two hundred thirteen".