135811215 has 72 divisors (see below), whose sum is σ = 260900880. Its totient is φ = 67016448.

The previous prime is 135811199. The next prime is 135811253. The reversal of 135811215 is 512118531.

It is not a de Polignac number, because 135811215 - 2⁴ = 135811199 is a prime.

It is a super-3 number, since 3×135811215³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2301856 + ... + 2301914.

Almost surely, 2^135811215 is an apocalyptic number.

135811215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

135811215 is a deficient number, since it is larger than the sum of its proper divisors (125089665).

135811215 is an equidigital number, since it uses as much as digits as its factorization.

135811215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166 (or 84 counting only the distinct ones).

The product of its digits is 1200, while the sum is 27.

The square root of 135811215 is about 11653.8068887381. The cubic root of 135811215 is about 514.0182572610.

Adding to 135811215 its reverse (512118531), we get a palindrome (647929746).

The spelling of 135811215 in words is "one hundred thirty-five million, eight hundred eleven thousand, two hundred fifteen".