133325891 has 4 divisors (see below), whose sum is σ = 136577784. Its totient is φ = 130074000.

The previous prime is 133325873. The next prime is 133325893. The reversal of 133325891 is 198523331.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 133325891 - 2²⁶ = 66217027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133325893) 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, 1625885 + ... + 1625966.

It is an arithmetic number, because the mean of its divisors is an integer number (34144446).

Almost surely, 2^133325891 is an apocalyptic number.

133325891 is a deficient number, since it is larger than the sum of its proper divisors (3251893).

133325891 is an equidigital number, since it uses as much as digits as its factorization.

133325891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3251892.

The product of its digits is 19440, while the sum is 35.

The square root of 133325891 is about 11546.6831168089. The cubic root of 133325891 is about 510.8634495351.

The spelling of 133325891 in words is "one hundred thirty-three million, three hundred twenty-five thousand, eight hundred ninety-one".