135172609091 has 4 divisors (see below), whose sum is σ = 145570502112. Its totient is φ = 124774716072.

The previous prime is 135172609081. The next prime is 135172609147. The reversal of 135172609091 is 190906271531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190906271531 = 65323 ⋅2922497.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135172609091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135172609001) 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, 5198946491 + ... + 5198946516.

It is an arithmetic number, because the mean of its divisors is an integer number (36392625528).

Almost surely, 2^135172609091 is an apocalyptic number.

135172609091 is a deficient number, since it is larger than the sum of its proper divisors (10397893021).

135172609091 is a wasteful number, since it uses less digits than its factorization.

135172609091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10397893020.

The product of its (nonzero) digits is 102060, while the sum is 44.

The spelling of 135172609091 in words is "one hundred thirty-five billion, one hundred seventy-two million, six hundred nine thousand, ninety-one".