31630133 has 2 divisors, whose sum is σ = 31630134. Its totient is φ = 31630132.

The previous prime is 31630103. The next prime is 31630139. The reversal of 31630133 is 33103613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24671089 + 6959044 = 4967^2 + 2638^2 .

It is a cyclic number.

It is not a de Polignac number, because 31630133 - 2¹⁰ = 31629109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31630139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15815066 + 15815067.

It is an arithmetic number, because the mean of its divisors is an integer number (15815067).

Almost surely, 2^31630133 is an apocalyptic number.

It is an amenable number.

31630133 is a deficient number, since it is larger than the sum of its proper divisors (1).

31630133 is an equidigital number, since it uses as much as digits as its factorization.

31630133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 20.

The square root of 31630133 is about 5624.0673004508. The cubic root of 31630133 is about 316.2522854433.

Adding to 31630133 its reverse (33103613), we get a palindrome (64733746).

The spelling of 31630133 in words is "thirty-one million, six hundred thirty thousand, one hundred thirty-three".