31222320233 has 6 divisors (see below), whose sum is σ = 33808784814. Its totient is φ = 28820603136.

The previous prime is 31222320211. The next prime is 31222320281. The reversal of 31222320233 is 33202322213.

It can be written as a sum of positive squares in 3 ways, for example, as 1628687449 + 29593632784 = 40357^2 + 172028^2 .

It is not a de Polignac number, because 31222320233 - 2¹² = 31222316137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31222320199 and 31222320208.

It is not an unprimeable number, because it can be changed into a prime (31222320293) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 92373560 + ... + 92373897.

It is an arithmetic number, because the mean of its divisors is an integer number (5634797469).

Almost surely, 2^31222320233 is an apocalyptic number.

It is an amenable number.

31222320233 is a deficient number, since it is larger than the sum of its proper divisors (2586464581).

31222320233 is a wasteful number, since it uses less digits than its factorization.

31222320233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184747483 (or 184747470 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 23.

Adding to 31222320233 its reverse (33202322213), we get a palindrome (64424642446).

The spelling of 31222320233 in words is "thirty-one billion, two hundred twenty-two million, three hundred twenty thousand, two hundred thirty-three".