134711991 has 20 divisors (see below), whose sum is σ = 205921672. Its totient is φ = 87717168.

The previous prime is 134711981. The next prime is 134712013. The reversal of 134711991 is 199117431.

It is not a de Polignac number, because 134711991 - 2⁵ = 134711959 is a prime.

It is a super-3 number, since 3×134711991³ (a number of 25 digits) contains 333 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 (134711971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 15856 + ... + 22821.

Almost surely, 2^134711991 is an apocalyptic number.

134711991 is a deficient number, since it is larger than the sum of its proper divisors (71209681).

134711991 is an equidigital number, since it uses as much as digits as its factorization.

134711991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38732 (or 38723 counting only the distinct ones).

The product of its digits is 6804, while the sum is 36.

The square root of 134711991 is about 11606.5494872507. The cubic root of 134711991 is about 512.6277180007.

The spelling of 134711991 in words is "one hundred thirty-four million, seven hundred eleven thousand, nine hundred ninety-one".