135231857 has 4 divisors (see below), whose sum is σ = 135263856. Its totient is φ = 135199860.

The previous prime is 135231791. The next prime is 135231869. The reversal of 135231857 is 758132531.

135231857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 758132531 = 13 ⋅58317887.

It is a cyclic number.

It is not a de Polignac number, because 135231857 - 2²² = 131037553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135237857) 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, 8483 + ... + 18504.

It is an arithmetic number, because the mean of its divisors is an integer number (33815964).

Almost surely, 2^135231857 is an apocalyptic number.

It is an amenable number.

135231857 is a deficient number, since it is larger than the sum of its proper divisors (31999).

135231857 is an equidigital number, since it uses as much as digits as its factorization.

135231857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31998.

The product of its digits is 25200, while the sum is 35.

The square root of 135231857 is about 11628.9232949573. The cubic root of 135231857 is about 513.2862974369.

The spelling of 135231857 in words is "one hundred thirty-five million, two hundred thirty-one thousand, eight hundred fifty-seven".