133991885 has 8 divisors (see below), whose sum is σ = 161385216. Its totient is φ = 106796880.

The previous prime is 133991873. The next prime is 133991887. The reversal of 133991885 is 588199331.

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

It is not a de Polignac number, because 133991885 - 2¹⁶ = 133926349 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 (133991887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48089 + ... + 50798.

It is an arithmetic number, because the mean of its divisors is an integer number (20173152).

Almost surely, 2^133991885 is an apocalyptic number.

It is an amenable number.

133991885 is a deficient number, since it is larger than the sum of its proper divisors (27393331).

133991885 is an equidigital number, since it uses as much as digits as its factorization.

133991885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99163.

The product of its digits is 233280, while the sum is 47.

The square root of 133991885 is about 11575.4863828696. The cubic root of 133991885 is about 511.7126645521.

The spelling of 133991885 in words is "one hundred thirty-three million, nine hundred ninety-one thousand, eight hundred eighty-five".