133009781 has 8 divisors (see below), whose sum is σ = 136768128. Its totient is φ = 129276000.

The previous prime is 133009753. The next prime is 133009787. The reversal of 133009781 is 187900331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 133009781 - 2²⁶ = 65900917 is a prime.

It is a super-2 number, since 2×133009781² = 35383203683335922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133009787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5126 + ... + 17096.

It is an arithmetic number, because the mean of its divisors is an integer number (17096016).

Almost surely, 2^133009781 is an apocalyptic number.

It is an amenable number.

133009781 is a deficient number, since it is larger than the sum of its proper divisors (3758347).

133009781 is a wasteful number, since it uses less digits than its factorization.

133009781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12283.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 133009781 is about 11532.9866470052. The cubic root of 133009781 is about 510.4593848780.

The spelling of 133009781 in words is "one hundred thirty-three million, nine thousand, seven hundred eighty-one".