31000133 has 4 divisors (see below), whose sum is σ = 31319820. Its totient is φ = 30680448.

The previous prime is 31000127. The next prime is 31000157. The reversal of 31000133 is 33100013.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5769604 + 25230529 = 2402^2 + 5023^2 .

It is a cyclic number.

It is not a de Polignac number, because 31000133 - 2¹² = 30996037 is a prime.

It is a super-2 number, since 2×31000133² = 1922016492035378, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31000183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159698 + ... + 159891.

It is an arithmetic number, because the mean of its divisors is an integer number (7829955).

Almost surely, 2^31000133 is an apocalyptic number.

It is an amenable number.

31000133 is a deficient number, since it is larger than the sum of its proper divisors (319687).

31000133 is an equidigital number, since it uses as much as digits as its factorization.

31000133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319686.

The product of its (nonzero) digits is 27, while the sum is 11.

The square root of 31000133 is about 5567.7763065698. The cubic root of 31000133 is about 314.1385144897.

Adding to 31000133 its reverse (33100013), we get a palindrome (64100146).

It can be divided in two parts, 3100013 and 3, that multiplied together give a palindrome (9300039).

The spelling of 31000133 in words is "thirty-one million, one hundred thirty-three", and thus it is an aban number.