135512231 has 2 divisors, whose sum is σ = 135512232. Its totient is φ = 135512230.

The previous prime is 135512213. The next prime is 135512249. The reversal of 135512231 is 132215531.

It is a happy number.

Together with previous prime (135512213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (135512213) and next prime (135512249).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135512231 is a prime.

It is a super-2 number, since 2×135512231² = 36727129501194722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 135512197 and 135512206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135512291) 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 as a sum of consecutive naturals, namely, 67756115 + 67756116.

It is an arithmetic number, because the mean of its divisors is an integer number (67756116).

Almost surely, 2^135512231 is an apocalyptic number.

135512231 is a deficient number, since it is larger than the sum of its proper divisors (1).

135512231 is an equidigital number, since it uses as much as digits as its factorization.

135512231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 900, while the sum is 23.

The square root of 135512231 is about 11640.9720814028. The cubic root of 135512231 is about 513.6407819325.

Adding to 135512231 its reverse (132215531), we get a palindrome (267727762).

The spelling of 135512231 in words is "one hundred thirty-five million, five hundred twelve thousand, two hundred thirty-one".