135603231 has 4 divisors (see below), whose sum is σ = 180804312. Its totient is φ = 90402152.

The previous prime is 135603211. The next prime is 135603253. The reversal of 135603231 is 132306531.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 135603231 - 2¹¹ = 135601183 is a prime.

It is a super-2 number, since 2×135603231² = 36776472515278722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135603211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22600536 + ... + 22600541.

It is an arithmetic number, because the mean of its divisors is an integer number (45201078).

Almost surely, 2^135603231 is an apocalyptic number.

135603231 is a deficient number, since it is larger than the sum of its proper divisors (45201081).

135603231 is an equidigital number, since it uses as much as digits as its factorization.

135603231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45201080.

The product of its (nonzero) digits is 1620, while the sum is 24.

The square root of 135603231 is about 11644.8800337316. The cubic root of 135603231 is about 513.7557306031.

Adding to 135603231 its reverse (132306531), we get a palindrome (267909762).

The spelling of 135603231 in words is "one hundred thirty-five million, six hundred three thousand, two hundred thirty-one".