133931393 has 2 divisors, whose sum is σ = 133931394. Its totient is φ = 133931392.

The previous prime is 133931363. The next prime is 133931407. The reversal of 133931393 is 393139331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87459904 + 46471489 = 9352^2 + 6817^2 .

It is a cyclic number.

It is not a de Polignac number, because 133931393 - 2⁸ = 133931137 is a prime.

It is not a weakly prime, because it can be changed into another prime (133931333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66965696 + 66965697.

It is an arithmetic number, because the mean of its divisors is an integer number (66965697).

Almost surely, 2^133931393 is an apocalyptic number.

It is an amenable number.

133931393 is a deficient number, since it is larger than the sum of its proper divisors (1).

133931393 is an equidigital number, since it uses as much as digits as its factorization.

133931393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19683, while the sum is 35.

The square root of 133931393 is about 11572.8731523334. The cubic root of 133931393 is about 511.6356469976.

The spelling of 133931393 in words is "one hundred thirty-three million, nine hundred thirty-one thousand, three hundred ninety-three".