133881719 has 4 divisors (see below), whose sum is σ = 138498360. Its totient is φ = 129265080.

The previous prime is 133881697. The next prime is 133881767. The reversal of 133881719 is 917188331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 917188331 = 907 ⋅1011233.

It is a cyclic number.

It is not a de Polignac number, because 133881719 - 2²⁰ = 132833143 is a prime.

It is a super-2 number, since 2×133881719² = 35848629364789922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133884719) 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, 2308277 + ... + 2308334.

It is an arithmetic number, because the mean of its divisors is an integer number (34624590).

Almost surely, 2^133881719 is an apocalyptic number.

133881719 is a deficient number, since it is larger than the sum of its proper divisors (4616641).

133881719 is an equidigital number, since it uses as much as digits as its factorization.

133881719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4616640.

The product of its digits is 36288, while the sum is 41.

The square root of 133881719 is about 11570.7268138177. The cubic root of 133881719 is about 511.5723854244.

The spelling of 133881719 in words is "one hundred thirty-three million, eight hundred eighty-one thousand, seven hundred nineteen".