31131222223 has 32 divisors (see below), whose sum is σ = 33746678784. Its totient is φ = 28644000000.

The previous prime is 31131222197. The next prime is 31131222229. The reversal of 31131222223 is 32222213113.

It is a cyclic number.

It is not a de Polignac number, because 31131222223 - 2¹⁷ = 31131091151 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31131222194 and 31131222203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31131222229) 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 31 ways as a sum of consecutive naturals, for example, 29620048 + ... + 29621098.

It is an arithmetic number, because the mean of its divisors is an integer number (1054583712).

Almost surely, 2^31131222223 is an apocalyptic number.

31131222223 is a deficient number, since it is larger than the sum of its proper divisors (2615456561).

31131222223 is a wasteful number, since it uses less digits than its factorization.

31131222223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1527.

The product of its digits is 864, while the sum is 22.

Adding to 31131222223 its reverse (32222213113), we get a palindrome (63353435336).

The spelling of 31131222223 in words is "thirty-one billion, one hundred thirty-one million, two hundred twenty-two thousand, two hundred twenty-three".