31223011123 has 4 divisors (see below), whose sum is σ = 31230681048. Its totient is φ = 31215341200.

The previous prime is 31223011111. The next prime is 31223011133. The reversal of 31223011123 is 32111032213.

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 31223011123 - 2¹³ = 31223002931 is a prime.

It is a super-2 number, since 2×31223011123² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31223011123.

It is not an unprimeable number, because it can be changed into a prime (31223011103) 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 3 ways as a sum of consecutive naturals, for example, 3828853 + ... + 3836998.

It is an arithmetic number, because the mean of its divisors is an integer number (7807670262).

Almost surely, 2^31223011123 is an apocalyptic number.

31223011123 is a deficient number, since it is larger than the sum of its proper divisors (7669925).

31223011123 is an equidigital number, since it uses as much as digits as its factorization.

31223011123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7669924.

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

Adding to 31223011123 its reverse (32111032213), we get a palindrome (63334043336).

The spelling of 31223011123 in words is "thirty-one billion, two hundred twenty-three million, eleven thousand, one hundred twenty-three".