31031213103 has 32 divisors (see below), whose sum is σ = 50838497280. Its totient is φ = 18549155520.

The previous prime is 31031213089. The next prime is 31031213131. The reversal of 31031213103 is 30131213013.

It is a happy number.

It is not a de Polignac number, because 31031213103 - 2⁹ = 31031212591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31031213303) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 693951 + ... + 737312.

It is an arithmetic number, because the mean of its divisors is an integer number (1588703040).

Almost surely, 2^31031213103 is an apocalyptic number.

31031213103 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

31031213103 is a deficient number, since it is larger than the sum of its proper divisors (19807284177).

31031213103 is a wasteful number, since it uses less digits than its factorization.

31031213103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1431356 (or 1431350 counting only the distinct ones).

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

Adding to 31031213103 its reverse (30131213013), we get a palindrome (61162426116).

The spelling of 31031213103 in words is "thirty-one billion, thirty-one million, two hundred thirteen thousand, one hundred three".