31000431123 has 12 divisors (see below), whose sum is σ = 44797806768. Its totient is φ = 20657997360.

The previous prime is 31000431101. The next prime is 31000431131. The reversal of 31000431123 is 32113400013.

It is not a de Polignac number, because 31000431123 - 2⁹ = 31000430611 is a prime.

It is a super-2 number, since 2×31000431123² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31000431096 and 31000431105.

It is not an unprimeable number, because it can be changed into a prime (31000481123) 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 11 ways as a sum of consecutive naturals, for example, 724440 + ... + 766037.

It is an arithmetic number, because the mean of its divisors is an integer number (3733150564).

Almost surely, 2^31000431123 is an apocalyptic number.

31000431123 is a deficient number, since it is larger than the sum of its proper divisors (13797375645).

31000431123 is a wasteful number, since it uses less digits than its factorization.

31000431123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1492794 (or 1492791 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 31000431123 its reverse (32113400013), we get a palindrome (63113831136).

The spelling of 31000431123 in words is "thirty-one billion, four hundred thirty-one thousand, one hundred twenty-three".