135525231 has 12 divisors (see below), whose sum is σ = 203009352. Its totient is φ = 90349992.

The previous prime is 135525217. The next prime is 135525239. The reversal of 135525231 is 132525531.

It is a happy number.

135525231 is a `hidden beast` number, since 135 + 5 + 2 + 523 + 1 = 666.

It is not a de Polignac number, because 135525231 - 2⁶ = 135525167 is a prime.

It is a super-2 number, since 2×135525231² = 36734176475206722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 135525195 and 135525204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135525239) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 278616 + ... + 279101.

It is an arithmetic number, because the mean of its divisors is an integer number (16917446).

Almost surely, 2^135525231 is an apocalyptic number.

135525231 is a deficient number, since it is larger than the sum of its proper divisors (67484121).

135525231 is an frugal number, since it uses more digits than its factorization.

135525231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557732 (or 557720 counting only the distinct ones).

The product of its digits is 4500, while the sum is 27.

The square root of 135525231 is about 11641.5304406251. The cubic root of 135525231 is about 513.6572063212.

The spelling of 135525231 in words is "one hundred thirty-five million, five hundred twenty-five thousand, two hundred thirty-one".