31132221233 has 2 divisors, whose sum is σ = 31132221234. Its totient is φ = 31132221232.

The previous prime is 31132221209. The next prime is 31132221247. The reversal of 31132221233 is 33212223113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29865715489 + 1266505744 = 172817^2 + 35588^2 .

It is a cyclic number.

It is not a de Polignac number, because 31132221233 - 2¹⁴ = 31132204849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31132221199 and 31132221208.

It is not a weakly prime, because it can be changed into another prime (31132226233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15566110616 + 15566110617.

It is an arithmetic number, because the mean of its divisors is an integer number (15566110617).

Almost surely, 2^31132221233 is an apocalyptic number.

It is an amenable number.

31132221233 is a deficient number, since it is larger than the sum of its proper divisors (1).

31132221233 is an equidigital number, since it uses as much as digits as its factorization.

31132221233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 23.

Adding to 31132221233 its reverse (33212223113), we get a palindrome (64344444346).

The spelling of 31132221233 in words is "thirty-one billion, one hundred thirty-two million, two hundred twenty-one thousand, two hundred thirty-three".