135623231 has 4 divisors (see below), whose sum is σ = 135653592. Its totient is φ = 135592872.

The previous prime is 135623221. The next prime is 135623239. The reversal of 135623231 is 132326531.

135623231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132326531 = 53 ⋅2496727.

It is a cyclic number.

It is not a de Polignac number, because 135623231 - 2¹⁸ = 135361087 is a prime.

It is a super-2 number, since 2×135623231² = 36787321573758722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 135623231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135623239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7016 + ... + 17901.

It is an arithmetic number, because the mean of its divisors is an integer number (33913398).

Almost surely, 2^135623231 is an apocalyptic number.

135623231 is a deficient number, since it is larger than the sum of its proper divisors (30361).

135623231 is an equidigital number, since it uses as much as digits as its factorization.

135623231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30360.

The product of its digits is 3240, while the sum is 26.

The square root of 135623231 is about 11645.7387485724. The cubic root of 135623231 is about 513.7809871534.

Adding to 135623231 its reverse (132326531), we get a palindrome (267949762).

The spelling of 135623231 in words is "one hundred thirty-five million, six hundred twenty-three thousand, two hundred thirty-one".