31012111223 has 4 divisors (see below), whose sum is σ = 31012502808. Its totient is φ = 31011719640.

The previous prime is 31012111199. The next prime is 31012111231. The reversal of 31012111223 is 32211121013.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 31012111223 - 2⁶ = 31012111159 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 (31012111283) 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, 30461 + ... + 250902.

It is an arithmetic number, because the mean of its divisors is an integer number (7753125702).

Almost surely, 2^31012111223 is an apocalyptic number.

31012111223 is a deficient number, since it is larger than the sum of its proper divisors (391585).

31012111223 is a wasteful number, since it uses less digits than its factorization.

31012111223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391584.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 31012111223 its reverse (32211121013), we get a palindrome (63223232236).

The spelling of 31012111223 in words is "thirty-one billion, twelve million, one hundred eleven thousand, two hundred twenty-three".