134991 has 12 divisors (see below), whose sum is σ = 199368. Its totient is φ = 87984.

The previous prime is 134989. The next prime is 134999. The reversal of 134991 is 199431.

It is not a de Polignac number, because 134991 - 2¹ = 134989 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 134991.

It is not an unprimeable number, because it can be changed into a prime (134999) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 336 + ... + 618.

It is an arithmetic number, because the mean of its divisors is an integer number (16614).

2¹³⁴⁹⁹¹ is an apocalyptic number.

134991 is a deficient number, since it is larger than the sum of its proper divisors (64377).

134991 is a wasteful number, since it uses less digits than its factorization.

134991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342 (or 339 counting only the distinct ones).

The product of its digits is 972, while the sum is 27.

The square root of 134991 is about 367.4112137646. The cubic root of 134991 is about 51.2981383910.

The spelling of 134991 in words is "one hundred thirty-four thousand, nine hundred ninety-one".