133870091 has 4 divisors (see below), whose sum is σ = 133894992. Its totient is φ = 133845192.

The previous prime is 133870069. The next prime is 133870111. The reversal of 133870091 is 190078331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190078331 = 107 ⋅1776433.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133870091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133870021) 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, 671 + ... + 16376.

It is an arithmetic number, because the mean of its divisors is an integer number (33473748).

Almost surely, 2^133870091 is an apocalyptic number.

133870091 is a deficient number, since it is larger than the sum of its proper divisors (24901).

133870091 is an equidigital number, since it uses as much as digits as its factorization.

133870091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24900.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 133870091 is about 11570.2243279895. The cubic root of 133870091 is about 511.5575745004.

The spelling of 133870091 in words is "one hundred thirty-three million, eight hundred seventy thousand, ninety-one".