133491121 has 4 divisors (see below), whose sum is σ = 136747044. Its totient is φ = 130235200.

The previous prime is 133491107. The next prime is 133491143. The reversal of 133491121 is 121194331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 67881121 + 65610000 = 8239^2 + 8100^2 .

It is a cyclic number.

It is not a de Polignac number, because 133491121 - 2¹¹ = 133489073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133491151) 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 3 ways as a sum of consecutive naturals, for example, 1627900 + ... + 1627981.

It is an arithmetic number, because the mean of its divisors is an integer number (34186761).

Almost surely, 2^133491121 is an apocalyptic number.

It is an amenable number.

133491121 is a deficient number, since it is larger than the sum of its proper divisors (3255923).

133491121 is an equidigital number, since it uses as much as digits as its factorization.

133491121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3255922.

The product of its digits is 648, while the sum is 25.

The square root of 133491121 is about 11553.8357699943. The cubic root of 133491121 is about 511.0743991152.

The spelling of 133491121 in words is "one hundred thirty-three million, four hundred ninety-one thousand, one hundred twenty-one".