133566493 has 2 divisors, whose sum is σ = 133566494. Its totient is φ = 133566492.

The previous prime is 133566487. The next prime is 133566509. The reversal of 133566493 is 394665331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130919364 + 2647129 = 11442^2 + 1627^2 .

It is an emirp because it is prime and its reverse (394665331) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133566493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133566193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66783246 + 66783247.

It is an arithmetic number, because the mean of its divisors is an integer number (66783247).

Almost surely, 2^133566493 is an apocalyptic number.

It is an amenable number.

133566493 is a deficient number, since it is larger than the sum of its proper divisors (1).

133566493 is an equidigital number, since it uses as much as digits as its factorization.

133566493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 40.

The square root of 133566493 is about 11557.0970836106. The cubic root of 133566493 is about 511.1705689371.

The spelling of 133566493 in words is "one hundred thirty-three million, five hundred sixty-six thousand, four hundred ninety-three".