134655991 has 4 divisors (see below), whose sum is σ = 134691984. Its totient is φ = 134620000.

The previous prime is 134655967. The next prime is 134656003. The reversal of 134655991 is 199556431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 199556431 = 1627 ⋅122653.

It is a cyclic number.

It is not a de Polignac number, because 134655991 - 2⁵ = 134655959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (134655901) 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, 11635 + ... + 20116.

It is an arithmetic number, because the mean of its divisors is an integer number (33672996).

Almost surely, 2^134655991 is an apocalyptic number.

134655991 is a deficient number, since it is larger than the sum of its proper divisors (35993).

134655991 is an equidigital number, since it uses as much as digits as its factorization.

134655991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35992.

The product of its digits is 145800, while the sum is 43.

The square root of 134655991 is about 11604.1368054673. The cubic root of 134655991 is about 512.5566747556.

The spelling of 134655991 in words is "one hundred thirty-four million, six hundred fifty-five thousand, nine hundred ninety-one".