135081731 has 4 divisors (see below), whose sum is σ = 135976464. Its totient is φ = 134187000.

The previous prime is 135081721. The next prime is 135081733. The reversal of 135081731 is 137180531.

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 135081731 - 2¹⁴ = 135065347 is a prime.

It is a super-2 number, since 2×135081731² = 36494148099912722, 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 = 135081694 and 135081703.

It is not an unprimeable number, because it can be changed into a prime (135081733) 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, 447140 + ... + 447441.

It is an arithmetic number, because the mean of its divisors is an integer number (33994116).

Almost surely, 2^135081731 is an apocalyptic number.

135081731 is a deficient number, since it is larger than the sum of its proper divisors (894733).

135081731 is an equidigital number, since it uses as much as digits as its factorization.

135081731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 894732.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 135081731 is about 11622.4666486938. The cubic root of 135081731 is about 513.0962875954.

The spelling of 135081731 in words is "one hundred thirty-five million, eighty-one thousand, seven hundred thirty-one".