31140433 has 4 divisors (see below), whose sum is σ = 31261860. Its totient is φ = 31019008.

The previous prime is 31140419. The next prime is 31140467. The reversal of 31140433 is 33404113.

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 24830289 + 6310144 = 4983^2 + 2512^2 .

It is a cyclic number.

It is not a de Polignac number, because 31140433 - 2⁵ = 31140401 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31140433.

It is not an unprimeable number, because it can be changed into a prime (31140493) 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 in 3 ways as a sum of consecutive naturals, for example, 60328 + ... + 60841.

It is an arithmetic number, because the mean of its divisors is an integer number (7815465).

Almost surely, 2^31140433 is an apocalyptic number.

It is an amenable number.

31140433 is a deficient number, since it is larger than the sum of its proper divisors (121427).

31140433 is a wasteful number, since it uses less digits than its factorization.

31140433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121426.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 31140433 is about 5580.3613682270. The cubic root of 31140433 is about 314.6117093516.

Adding to 31140433 its reverse (33404113), we get a palindrome (64544546).

The spelling of 31140433 in words is "thirty-one million, one hundred forty thousand, four hundred thirty-three".