135251 has 4 divisors (see below), whose sum is σ = 136104. Its totient is φ = 134400.

The previous prime is 135241. The next prime is 135257. The reversal of 135251 is 152531.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 135251 - 2¹⁰ = 134227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135257) 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, 110 + ... + 531.

It is an arithmetic number, because the mean of its divisors is an integer number (34026).

2¹³⁵²⁵¹ is an apocalyptic number.

135251 is a deficient number, since it is larger than the sum of its proper divisors (853).

135251 is an equidigital number, since it uses as much as digits as its factorization.

135251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852.

The product of its digits is 150, while the sum is 17.

The square root of 135251 is about 367.7648705355. The cubic root of 135251 is about 51.3310516030.

Adding to 135251 its reverse (152531), we get a palindrome (287782).

The spelling of 135251 in words is "one hundred thirty-five thousand, two hundred fifty-one".