31123211011 has 8 divisors (see below), whose sum is σ = 31335593184. Its totient is φ = 30911138880.

The previous prime is 31123210999. The next prime is 31123211083. The reversal of 31123211011 is 11011232113.

It is a happy number.

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

It is not a de Polignac number, because 31123211011 - 2¹⁹ = 31122686723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31123211411) 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 7 ways as a sum of consecutive naturals, for example, 125751 + ... + 279391.

It is an arithmetic number, because the mean of its divisors is an integer number (3916949148).

Almost surely, 2^31123211011 is an apocalyptic number.

31123211011 is a deficient number, since it is larger than the sum of its proper divisors (212382173).

31123211011 is a wasteful number, since it uses less digits than its factorization.

31123211011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155021.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 31123211011 its reverse (11011232113), we get a palindrome (42134443124).

It can be divided in two parts, 3112 and 3211011, that added together give a palindrome (3214123).

The spelling of 31123211011 in words is "thirty-one billion, one hundred twenty-three million, two hundred eleven thousand, eleven".