135705731 has 4 divisors (see below), whose sum is σ = 155092272. Its totient is φ = 116319192.

The previous prime is 135705719. The next prime is 135705767. The reversal of 135705731 is 137507531.

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 135705731 - 2⁶ = 135705667 is a prime.

It is a super-2 number, since 2×135705731² = 36832090852488722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135705701) 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, 9693260 + ... + 9693273.

It is an arithmetic number, because the mean of its divisors is an integer number (38773068).

Almost surely, 2^135705731 is an apocalyptic number.

135705731 is a deficient number, since it is larger than the sum of its proper divisors (19386541).

135705731 is an equidigital number, since it uses as much as digits as its factorization.

135705731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19386540.

The product of its (nonzero) digits is 11025, while the sum is 32.

The square root of 135705731 is about 11649.2802781974. The cubic root of 135705731 is about 513.8851441855.

The spelling of 135705731 in words is "one hundred thirty-five million, seven hundred five thousand, seven hundred thirty-one".