31222133 has 2 divisors, whose sum is σ = 31222134. Its totient is φ = 31222132.

The previous prime is 31222129. The next prime is 31222157. The reversal of 31222133 is 33122213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30713764 + 508369 = 5542^2 + 713^2 .

It is a cyclic number.

It is not a de Polignac number, because 31222133 - 2² = 31222129 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31222123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15611066 + 15611067.

It is an arithmetic number, because the mean of its divisors is an integer number (15611067).

Almost surely, 2^31222133 is an apocalyptic number.

It is an amenable number.

31222133 is a deficient number, since it is larger than the sum of its proper divisors (1).

31222133 is an equidigital number, since it uses as much as digits as its factorization.

31222133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 17.

The square root of 31222133 is about 5587.6768875804. The cubic root of 31222133 is about 314.8866073763.

Adding to 31222133 its reverse (33122213), we get a palindrome (64344346).

It can be divided in two parts, 3122213 and 3, that multiplied together give a palindrome (9366639).

The spelling of 31222133 in words is "thirty-one million, two hundred twenty-two thousand, one hundred thirty-three".