31230223133 has 12 divisors (see below), whose sum is σ = 33260082228. Its totient is φ = 29222772480.

The previous prime is 31230223109. The next prime is 31230223139. The reversal of 31230223133 is 33132203213.

It can be written as a sum of positive squares in 6 ways, for example, as 3159901369 + 28070321764 = 56213^2 + 167542^2 .

It is not a de Polignac number, because 31230223133 - 2¹⁸ = 31229960989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31230223099 and 31230223108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31230223139) 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, 478103 + ... + 539483.

It is an arithmetic number, because the mean of its divisors is an integer number (2771673519).

Almost surely, 2^31230223133 is an apocalyptic number.

It is an amenable number.

31230223133 is a deficient number, since it is larger than the sum of its proper divisors (2029859095).

31230223133 is an equidigital number, since it uses as much as digits as its factorization.

31230223133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61744 (or 61571 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 31230223133 its reverse (33132203213), we get a palindrome (64362426346).

The spelling of 31230223133 in words is "thirty-one billion, two hundred thirty million, two hundred twenty-three thousand, one hundred thirty-three".