133787521 has 8 divisors (see below), whose sum is σ = 156153600. Its totient is φ = 112234848.

The previous prime is 133787509. The next prime is 133787539. The reversal of 133787521 is 125787331.

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 133787521 - 2¹³ = 133779329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133785521) 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, 202996 + ... + 203653.

It is an arithmetic number, because the mean of its divisors is an integer number (19519200).

Almost surely, 2^133787521 is an apocalyptic number.

It is an amenable number.

133787521 is a deficient number, since it is larger than the sum of its proper divisors (22366079).

133787521 is an equidigital number, since it uses as much as digits as its factorization.

133787521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406703.

The product of its digits is 35280, while the sum is 37.

The square root of 133787521 is about 11566.6555667574. The cubic root of 133787521 is about 511.4523779976.

The spelling of 133787521 in words is "one hundred thirty-three million, seven hundred eighty-seven thousand, five hundred twenty-one".