31103320133 has 4 divisors (see below), whose sum is σ = 31103716800. Its totient is φ = 31102923468.

The previous prime is 31103320111. The next prime is 31103320147. The reversal of 31103320133 is 33102330113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 31103320133 - 2²⁸ = 30834884677 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31103340133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36935 + ... + 252132.

It is an arithmetic number, because the mean of its divisors is an integer number (7775929200).

Almost surely, 2^31103320133 is an apocalyptic number.

It is an amenable number.

31103320133 is a deficient number, since it is larger than the sum of its proper divisors (396667).

31103320133 is a wasteful number, since it uses less digits than its factorization.

31103320133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396666.

The product of its (nonzero) digits is 486, while the sum is 20.

Adding to 31103320133 its reverse (33102330113), we get a palindrome (64205650246).

The spelling of 31103320133 in words is "thirty-one billion, one hundred three million, three hundred twenty thousand, one hundred thirty-three".