133406491 has 2 divisors, whose sum is σ = 133406492. Its totient is φ = 133406490.

The previous prime is 133406473. The next prime is 133406519. The reversal of 133406491 is 194604331.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 133406491 - 2⁷ = 133406363 is a prime.

It is not a weakly prime, because it can be changed into another prime (133406401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66703245 + 66703246.

It is an arithmetic number, because the mean of its divisors is an integer number (66703246).

Almost surely, 2^133406491 is an apocalyptic number.

133406491 is a deficient number, since it is larger than the sum of its proper divisors (1).

133406491 is an equidigital number, since it uses as much as digits as its factorization.

133406491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 133406491 is about 11550.1727692706. The cubic root of 133406491 is about 510.9663735288.

The spelling of 133406491 in words is "one hundred thirty-three million, four hundred six thousand, four hundred ninety-one".