133189121 has 4 divisors (see below), whose sum is σ = 143434452. Its totient is φ = 122943792.

The previous prime is 133189087. The next prime is 133189129. The reversal of 133189121 is 121981331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121981331 = 4273 ⋅28547.

It can be written as a sum of positive squares in 2 ways, for example, as 83978896 + 49210225 = 9164^2 + 7015^2 .

It is a cyclic number.

It is not a de Polignac number, because 133189121 - 2⁶ = 133189057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133189129) 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, 5122646 + ... + 5122671.

It is an arithmetic number, because the mean of its divisors is an integer number (35858613).

Almost surely, 2^133189121 is an apocalyptic number.

It is an amenable number.

133189121 is a deficient number, since it is larger than the sum of its proper divisors (10245331).

133189121 is a wasteful number, since it uses less digits than its factorization.

133189121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10245330.

The product of its digits is 1296, while the sum is 29.

The square root of 133189121 is about 11540.7591171465. The cubic root of 133189121 is about 510.6887030324.

The spelling of 133189121 in words is "one hundred thirty-three million, one hundred eighty-nine thousand, one hundred twenty-one".