31123201133 has 4 divisors (see below), whose sum is σ = 31549546428. Its totient is φ = 30696855840.

The previous prime is 31123201117. The next prime is 31123201139. The reversal of 31123201133 is 33110232113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33110232113 = 7 ⋅4730033159.

It can be written as a sum of positive squares in 2 ways, for example, as 22392728164 + 8730472969 = 149642^2 + 93437^2 .

It is a cyclic number.

It is not a de Polignac number, because 31123201133 - 2⁴ = 31123201117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31123201139) 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, 213172538 + ... + 213172683.

It is an arithmetic number, because the mean of its divisors is an integer number (7887386607).

Almost surely, 2^31123201133 is an apocalyptic number.

It is an amenable number.

31123201133 is a deficient number, since it is larger than the sum of its proper divisors (426345295).

31123201133 is an equidigital number, since it uses as much as digits as its factorization.

31123201133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426345294.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31123201133 its reverse (33110232113), we get a palindrome (64233433246).

The spelling of 31123201133 in words is "thirty-one billion, one hundred twenty-three million, two hundred one thousand, one hundred thirty-three".