135242531 has 8 divisors (see below), whose sum is σ = 144808560. Its totient is φ = 125855488.

The previous prime is 135242521. The next prime is 135242539.

It is a happy number.

135242531 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 135242531 - 2⁶ = 135242467 is a prime.

It is a super-2 number, since 2×135242531² = 36581084382571922, 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 135242531.

It is not an unprimeable number, because it can be changed into a prime (135242539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43181 + ... + 46206.

It is an arithmetic number, because the mean of its divisors is an integer number (18101070).

Almost surely, 2^135242531 is an apocalyptic number.

135242531 is a deficient number, since it is larger than the sum of its proper divisors (9566029).

135242531 is an equidigital number, since it uses as much as digits as its factorization.

135242531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89493.

The product of its digits is 3600, while the sum is 26.

The square root of 135242531 is about 11629.3822277884. The cubic root of 135242531 is about 513.2998018333.

The spelling of 135242531 in words is "one hundred thirty-five million, two hundred forty-two thousand, five hundred thirty-one".