33131393 has 2 divisors, whose sum is σ = 33131394. Its totient is φ = 33131392.

The previous prime is 33131387. The next prime is 33131429. The reversal of 33131393 is 39313133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27804529 + 5326864 = 5273^2 + 2308^2 .

It is an emirp because it is prime and its reverse (39313133) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33131393 - 2¹⁰ = 33130369 is a prime.

It is not a weakly prime, because it can be changed into another prime (33131323) 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, 16565696 + 16565697.

It is an arithmetic number, because the mean of its divisors is an integer number (16565697).

Almost surely, 2^33131393 is an apocalyptic number.

It is an amenable number.

33131393 is a deficient number, since it is larger than the sum of its proper divisors (1).

33131393 is an equidigital number, since it uses as much as digits as its factorization.

33131393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2187, while the sum is 26.

The square root of 33131393 is about 5755.9875781659. The cubic root of 33131393 is about 321.1785738543.

The spelling of 33131393 in words is "thirty-three million, one hundred thirty-one thousand, three hundred ninety-three".