31323220133 has 2 divisors, whose sum is σ = 31323220134. Its totient is φ = 31323220132.

The previous prime is 31323220121. The next prime is 31323220141. The reversal of 31323220133 is 33102232313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30571473409 + 751746724 = 174847^2 + 27418^2 .

It is a cyclic number.

It is not a de Polignac number, because 31323220133 - 2⁸ = 31323219877 is a prime.

It is a super-2 number, since 2×31323220133² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31323220099 and 31323220108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31323220163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15661610066 + 15661610067.

It is an arithmetic number, because the mean of its divisors is an integer number (15661610067).

Almost surely, 2^31323220133 is an apocalyptic number.

It is an amenable number.

31323220133 is a deficient number, since it is larger than the sum of its proper divisors (1).

31323220133 is an equidigital number, since it uses as much as digits as its factorization.

31323220133 is an odious number, because the sum of its binary digits is odd.

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

Adding to 31323220133 its reverse (33102232313), we get a palindrome (64425452446).

The spelling of 31323220133 in words is "thirty-one billion, three hundred twenty-three million, two hundred twenty thousand, one hundred thirty-three".