133231393 has 2 divisors, whose sum is σ = 133231394. Its totient is φ = 133231392.

The previous prime is 133231391. The next prime is 133231403. The reversal of 133231393 is 393132331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112954384 + 20277009 = 10628^2 + 4503^2 .

It is an emirp because it is prime and its reverse (393132331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133231393 - 2¹ = 133231391 is a prime.

Together with 133231391, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (133231391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66615696 + 66615697.

It is an arithmetic number, because the mean of its divisors is an integer number (66615697).

Almost surely, 2^133231393 is an apocalyptic number.

It is an amenable number.

133231393 is a deficient number, since it is larger than the sum of its proper divisors (1).

133231393 is an equidigital number, since it uses as much as digits as its factorization.

133231393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4374, while the sum is 28.

The square root of 133231393 is about 11542.5903938414. The cubic root of 133231393 is about 510.7427253360.

The spelling of 133231393 in words is "one hundred thirty-three million, two hundred thirty-one thousand, three hundred ninety-three".