133535821 has 4 divisors (see below), whose sum is σ = 135799200. Its totient is φ = 131272444.

The previous prime is 133535783. The next prime is 133535851. The reversal of 133535821 is 128535331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 133535821 - 2¹¹ = 133533773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133535851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1131601 + ... + 1131718.

It is an arithmetic number, because the mean of its divisors is an integer number (33949800).

Almost surely, 2^133535821 is an apocalyptic number.

It is an amenable number.

133535821 is a deficient number, since it is larger than the sum of its proper divisors (2263379).

133535821 is an equidigital number, since it uses as much as digits as its factorization.

133535821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2263378.

The product of its digits is 10800, while the sum is 31.

The square root of 133535821 is about 11555.7700305951. The cubic root of 133535821 is about 511.1314378057.

The spelling of 133535821 in words is "one hundred thirty-three million, five hundred thirty-five thousand, eight hundred twenty-one".