31312103203 has 4 divisors (see below), whose sum is σ = 31313193048. Its totient is φ = 31311013360.

The previous prime is 31312103201. The next prime is 31312103243. The reversal of 31312103203 is 30230121313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30230121313 = 7 ⋅4318588759.

It is a cyclic number.

It is not a de Polignac number, because 31312103203 - 2¹ = 31312103201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31312103201) 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, 500626 + ... + 559687.

It is an arithmetic number, because the mean of its divisors is an integer number (7828298262).

Almost surely, 2^31312103203 is an apocalyptic number.

31312103203 is a deficient number, since it is larger than the sum of its proper divisors (1089845).

31312103203 is a wasteful number, since it uses less digits than its factorization.

31312103203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1089844.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 31312103203 its reverse (30230121313), we get a palindrome (61542224516).

The spelling of 31312103203 in words is "thirty-one billion, three hundred twelve million, one hundred three thousand, two hundred three".