31312003 has 4 divisors (see below), whose sum is σ = 31360608. Its totient is φ = 31263400.

The previous prime is 31311997. The next prime is 31312007. The reversal of 31312003 is 30021313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30021313 = 7 ⋅4288759.

It is a cyclic number.

It is not a de Polignac number, because 31312003 - 2⁹ = 31311491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31312007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23323 + ... + 24628.

It is an arithmetic number, because the mean of its divisors is an integer number (7840152).

Almost surely, 2^31312003 is an apocalyptic number.

31312003 is a deficient number, since it is larger than the sum of its proper divisors (48605).

31312003 is an equidigital number, since it uses as much as digits as its factorization.

31312003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48604.

The product of its (nonzero) digits is 54, while the sum is 13.

The square root of 31312003 is about 5595.7129125787. The cubic root of 31312003 is about 315.1884418780.

Adding to 31312003 its reverse (30021313), we get a palindrome (61333316).

The spelling of 31312003 in words is "thirty-one million, three hundred twelve thousand, three".