135194391 has 12 divisors (see below), whose sum is σ = 203771568. Its totient is φ = 86210784.

The previous prime is 135194357. The next prime is 135194399. The reversal of 135194391 is 193491531.

135194391 is a `hidden beast` number, since 13 + 519 + 43 + 91 = 666.

135194391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 135194391 - 2⁶ = 135194327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135194399) 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, 326350 + ... + 326763.

It is an arithmetic number, because the mean of its divisors is an integer number (16980964).

Almost surely, 2^135194391 is an apocalyptic number.

135194391 is a deficient number, since it is larger than the sum of its proper divisors (68577177).

135194391 is a wasteful number, since it uses less digits than its factorization.

135194391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653142 (or 653139 counting only the distinct ones).

The product of its digits is 14580, while the sum is 36.

The square root of 135194391 is about 11627.3122861648. The cubic root of 135194391 is about 513.2388910513.

The spelling of 135194391 in words is "one hundred thirty-five million, one hundred ninety-four thousand, three hundred ninety-one".