135145231 has 8 divisors (see below), whose sum is σ = 147714224. Its totient is φ = 122886720.

The previous prime is 135145211. The next prime is 135145237. The reversal of 135145231 is 132541531.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 135145231 - 2⁷ = 135145103 is a prime.

It is a super-2 number, since 2×135145231² = 36528466924086722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 135145196 and 135145205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135145237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76710 + ... + 78451.

It is an arithmetic number, because the mean of its divisors is an integer number (18464278).

Almost surely, 2^135145231 is an apocalyptic number.

135145231 is a deficient number, since it is larger than the sum of its proper divisors (12568993).

135145231 is a wasteful number, since it uses less digits than its factorization.

135145231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155241.

The product of its digits is 1800, while the sum is 25.

The square root of 135145231 is about 11625.1981058389. The cubic root of 135145231 is about 513.1766747555.

Adding to 135145231 its reverse (132541531), we get a palindrome (267686762).

The spelling of 135145231 in words is "one hundred thirty-five million, one hundred forty-five thousand, two hundred thirty-one".