133493491 has 4 divisors (see below), whose sum is σ = 133557984. Its totient is φ = 133429000.

The previous prime is 133493461. The next prime is 133493509. The reversal of 133493491 is 194394331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194394331 = 383 ⋅507557.

It is a cyclic number.

It is not a de Polignac number, because 133493491 - 2⁷ = 133493363 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 133493491.

It is not an unprimeable number, because it can be changed into a prime (133493431) 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 in 3 ways as a sum of consecutive naturals, for example, 29035 + ... + 33316.

It is an arithmetic number, because the mean of its divisors is an integer number (33389496).

Almost surely, 2^133493491 is an apocalyptic number.

133493491 is a deficient number, since it is larger than the sum of its proper divisors (64493).

133493491 is an equidigital number, since it uses as much as digits as its factorization.

133493491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64492.

The product of its digits is 34992, while the sum is 37.

The square root of 133493491 is about 11553.9383328803. The cubic root of 133493491 is about 511.0774236339.

The spelling of 133493491 in words is "one hundred thirty-three million, four hundred ninety-three thousand, four hundred ninety-one".