133897749 has 8 divisors (see below), whose sum is σ = 178584192. Its totient is φ = 89238240.

The previous prime is 133897679. The next prime is 133897781. The reversal of 133897749 is 947798331.

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

It is not a de Polignac number, because 133897749 - 2¹¹ = 133895701 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133897249) 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, 13929 + ... + 21489.

It is an arithmetic number, because the mean of its divisors is an integer number (22323024).

Almost surely, 2^133897749 is an apocalyptic number.

It is an amenable number.

133897749 is a deficient number, since it is larger than the sum of its proper divisors (44686443).

133897749 is an equidigital number, since it uses as much as digits as its factorization.

133897749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13467.

The product of its digits is 1143072, while the sum is 51.

The square root of 133897749 is about 11571.4194894144. The cubic root of 133897749 is about 511.5928018988.

The spelling of 133897749 in words is "one hundred thirty-three million, eight hundred ninety-seven thousand, seven hundred forty-nine".