135612261 has 6 divisors (see below), whose sum is σ = 195884390. Its totient is φ = 90408168.

The previous prime is 135612229. The next prime is 135612263. The reversal of 135612261 is 162216531.

It can be written as a sum of positive squares in only one way, i.e., 78322500 + 57289761 = 8850^2 + 7569^2 .

It is not a de Polignac number, because 135612261 - 2⁵ = 135612229 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135612263) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7534006 + ... + 7534023.

Almost surely, 2^135612261 is an apocalyptic number.

It is an amenable number.

135612261 is a deficient number, since it is larger than the sum of its proper divisors (60272129).

135612261 is a wasteful number, since it uses less digits than its factorization.

135612261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15068035 (or 15068032 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 135612261 is about 11645.2677513229. The cubic root of 135612261 is about 513.7671342430.

Adding to 135612261 its reverse (162216531), we get a palindrome (297828792).

The spelling of 135612261 in words is "one hundred thirty-five million, six hundred twelve thousand, two hundred sixty-one".