31132320211 has 4 divisors (see below), whose sum is σ = 32770863400. Its totient is φ = 29493777024.

The previous prime is 31132320209. The next prime is 31132320227. The reversal of 31132320211 is 11202323113.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31132320211 - 2¹ = 31132320209 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 1638543169 = 31132320211 / (3 + 1 + 1 + 3 + 2 + 3 + 2 + 0 + 2 + 1 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31132320811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 819271566 + ... + 819271603.

It is an arithmetic number, because the mean of its divisors is an integer number (8192715850).

Almost surely, 2^31132320211 is an apocalyptic number.

31132320211 is a deficient number, since it is larger than the sum of its proper divisors (1638543189).

31132320211 is a wasteful number, since it uses less digits than its factorization.

31132320211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1638543188.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31132320211 its reverse (11202323113), we get a palindrome (42334643324).

The spelling of 31132320211 in words is "thirty-one billion, one hundred thirty-two million, three hundred twenty thousand, two hundred eleven".