31012133 has 2 divisors, whose sum is σ = 31012134. Its totient is φ = 31012132.

The previous prime is 31012129. The next prime is 31012141. The reversal of 31012133 is 33121013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18852964 + 12159169 = 4342^2 + 3487^2 .

It is a cyclic number.

It is not a de Polignac number, because 31012133 - 2² = 31012129 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31012193) 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, 15506066 + 15506067.

It is an arithmetic number, because the mean of its divisors is an integer number (15506067).

Almost surely, 2^31012133 is an apocalyptic number.

It is an amenable number.

31012133 is a deficient number, since it is larger than the sum of its proper divisors (1).

31012133 is an equidigital number, since it uses as much as digits as its factorization.

31012133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 31012133 is about 5568.8538318042. The cubic root of 31012133 is about 314.1790430887.

Adding to 31012133 its reverse (33121013), we get a palindrome (64133146).

The spelling of 31012133 in words is "thirty-one million, twelve thousand, one hundred thirty-three".