31121303103 has 12 divisors (see below), whose sum is σ = 49039629288. Its totient is φ = 18861395760.

The previous prime is 31121303053. The next prime is 31121303111. The reversal of 31121303103 is 30130312113.

It is a happy number.

It is not a de Polignac number, because 31121303103 - 2⁹ = 31121302591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31121303153) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 157178200 + ... + 157178397.

It is an arithmetic number, because the mean of its divisors is an integer number (4086635774).

Almost surely, 2^31121303103 is an apocalyptic number.

31121303103 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

31121303103 is a deficient number, since it is larger than the sum of its proper divisors (17918326185).

31121303103 is a wasteful number, since it uses less digits than its factorization.

31121303103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314356614 (or 314356611 counting only the distinct ones).

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

Adding to 31121303103 its reverse (30130312113), we get a palindrome (61251615216).

The spelling of 31121303103 in words is "thirty-one billion, one hundred twenty-one million, three hundred three thousand, one hundred three".