135023791 has 4 divisors (see below), whose sum is σ = 154312912. Its totient is φ = 115734672.

The previous prime is 135023789. The next prime is 135023803. The reversal of 135023791 is 197320531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 197320531 = 1657 ⋅119083.

It is a cyclic number.

It is not a de Polignac number, because 135023791 - 2¹ = 135023789 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 (135023711) 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, 9644550 + ... + 9644563.

It is an arithmetic number, because the mean of its divisors is an integer number (38578228).

Almost surely, 2^135023791 is an apocalyptic number.

135023791 is a deficient number, since it is larger than the sum of its proper divisors (19289121).

135023791 is an equidigital number, since it uses as much as digits as its factorization.

135023791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19289120.

The product of its (nonzero) digits is 5670, while the sum is 31.

The square root of 135023791 is about 11619.9737951512. The cubic root of 135023791 is about 513.0229170757.

The spelling of 135023791 in words is "one hundred thirty-five million, twenty-three thousand, seven hundred ninety-one".