135788891 has 4 divisors (see below), whose sum is σ = 155187312. Its totient is φ = 116390472.

The previous prime is 135788881. The next prime is 135788893. The reversal of 135788891 is 198887531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198887531 = 389 ⋅511279.

It is a cyclic number.

It is not a de Polignac number, because 135788891 - 2¹⁸ = 135526747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (135788893) 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, 9699200 + ... + 9699213.

It is an arithmetic number, because the mean of its divisors is an integer number (38796828).

Almost surely, 2^135788891 is an apocalyptic number.

135788891 is a deficient number, since it is larger than the sum of its proper divisors (19398421).

135788891 is an equidigital number, since it uses as much as digits as its factorization.

135788891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19398420.

The product of its digits is 483840, while the sum is 50.

The square root of 135788891 is about 11652.8490507687. The cubic root of 135788891 is about 513.9900917609.

The spelling of 135788891 in words is "one hundred thirty-five million, seven hundred eighty-eight thousand, eight hundred ninety-one".