31323013123 has 16 divisors (see below), whose sum is σ = 31970099200. Its totient is φ = 30682735200.

The previous prime is 31323013121. The next prime is 31323013157. The reversal of 31323013123 is 32131032313.

It is a cyclic number.

It is not a de Polignac number, because 31323013123 - 2¹ = 31323013121 is a prime.

It is a super-2 number, since 2×31323013123² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31323013094 and 31323013103.

It is not an unprimeable number, because it can be changed into a prime (31323013121) 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 15 ways as a sum of consecutive naturals, for example, 15256165 + ... + 15258217.

It is an arithmetic number, because the mean of its divisors is an integer number (1998131200).

Almost surely, 2^31323013123 is an apocalyptic number.

31323013123 is a deficient number, since it is larger than the sum of its proper divisors (647086077).

31323013123 is a wasteful number, since it uses less digits than its factorization.

31323013123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3562.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 31323013123 its reverse (32131032313), we get a palindrome (63454045436).

The spelling of 31323013123 in words is "thirty-one billion, three hundred twenty-three million, thirteen thousand, one hundred twenty-three".