31031013133 has 4 divisors (see below), whose sum is σ = 31468069728. Its totient is φ = 30593956540.

The previous prime is 31031013131. The next prime is 31031013149. The reversal of 31031013133 is 33131013013.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 31031013133 - 2¹ = 31031013131 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31031013133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31031013131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218528191 + ... + 218528332.

It is an arithmetic number, because the mean of its divisors is an integer number (7867017432).

Almost surely, 2^31031013133 is an apocalyptic number.

It is an amenable number.

31031013133 is a deficient number, since it is larger than the sum of its proper divisors (437056595).

31031013133 is an equidigital number, since it uses as much as digits as its factorization.

31031013133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437056594.

The product of its (nonzero) digits is 243, while the sum is 19.

Adding to 31031013133 its reverse (33131013013), we get a palindrome (64162026146).

The spelling of 31031013133 in words is "thirty-one billion, thirty-one million, thirteen thousand, one hundred thirty-three".