31131022223 has 16 divisors (see below), whose sum is σ = 37389665280. Its totient is φ = 25358762016.

The previous prime is 31131022201. The next prime is 31131022249. The reversal of 31131022223 is 32222013113.

It is not a de Polignac number, because 31131022223 - 2⁶ = 31131022159 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31131022195 and 31131022204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31131022423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1386503 + ... + 1408776.

It is an arithmetic number, because the mean of its divisors is an integer number (2336854080).

Almost surely, 2^31131022223 is an apocalyptic number.

31131022223 is a deficient number, since it is larger than the sum of its proper divisors (6258643057).

31131022223 is a wasteful number, since it uses less digits than its factorization.

31131022223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2795366.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31131022223 its reverse (32222013113), we get a palindrome (63353035336).

The spelling of 31131022223 in words is "thirty-one billion, one hundred thirty-one million, twenty-two thousand, two hundred twenty-three".