31131312003 has 24 divisors (see below), whose sum is σ = 49505467440. Its totient is φ = 18694359360.

The previous prime is 31131311989. The next prime is 31131312011. The reversal of 31131312003 is 30021313113.

It is a happy number.

It is not a de Polignac number, because 31131312003 - 2⁸ = 31131311747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31131312053) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1431676 + ... + 1453257.

It is an arithmetic number, because the mean of its divisors is an integer number (2062727810).

Almost surely, 2^31131312003 is an apocalyptic number.

31131312003 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

31131312003 is a deficient number, since it is larger than the sum of its proper divisors (18374155437).

31131312003 is a wasteful number, since it uses less digits than its factorization.

31131312003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2885059 (or 2885056 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 31131312003 its reverse (30021313113), we get a palindrome (61152625116).

The spelling of 31131312003 in words is "thirty-one billion, one hundred thirty-one million, three hundred twelve thousand, three".