31121231103 has 8 divisors (see below), whose sum is σ = 46105527600. Its totient is φ = 20747487384.

The previous prime is 31121231081. The next prime is 31121231131. The reversal of 31121231103 is 30113212113.

31121231103 is a `hidden beast` number, since 311 + 21 + 231 + 103 = 666.

It is not a de Polignac number, because 31121231103 - 2¹⁰ = 31121230079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31121231903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 576319068 + ... + 576319121.

It is an arithmetic number, because the mean of its divisors is an integer number (5763190950).

Almost surely, 2^31121231103 is an apocalyptic number.

31121231103 is a deficient number, since it is larger than the sum of its proper divisors (14984296497).

31121231103 is a wasteful number, since it uses less digits than its factorization.

31121231103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1152638198 (or 1152638192 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 31121231103 its reverse (30113212113), we get a palindrome (61234443216).

The spelling of 31121231103 in words is "thirty-one billion, one hundred twenty-one million, two hundred thirty-one thousand, one hundred three".