135236131 has 4 divisors (see below), whose sum is σ = 135280152. Its totient is φ = 135192112.

The previous prime is 135236119. The next prime is 135236137. The reversal of 135236131 is 131632531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131632531 = 1367 ⋅96293.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135236131 is a prime.

It is a super-2 number, since 2×135236131² = 36577622255698322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 135236096 and 135236105.

It is not an unprimeable number, because it can be changed into a prime (135236137) 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, 17026 + ... + 23671.

It is an arithmetic number, because the mean of its divisors is an integer number (33820038).

Almost surely, 2^135236131 is an apocalyptic number.

135236131 is a deficient number, since it is larger than the sum of its proper divisors (44021).

135236131 is an equidigital number, since it uses as much as digits as its factorization.

135236131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44020.

The product of its digits is 1620, while the sum is 25.

The square root of 135236131 is about 11629.1070594436. The cubic root of 135236131 is about 513.2917048475.

Adding to 135236131 its reverse (131632531), we get a palindrome (266868662).

The spelling of 135236131 in words is "one hundred thirty-five million, two hundred thirty-six thousand, one hundred thirty-one".