135731291 has 4 divisors (see below), whose sum is σ = 135842784. Its totient is φ = 135619800.

The previous prime is 135731287. The next prime is 135731293. The reversal of 135731291 is 192137531.

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 135731291 - 2² = 135731287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135731293) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53900 + ... + 56361.

It is an arithmetic number, because the mean of its divisors is an integer number (33960696).

Almost surely, 2^135731291 is an apocalyptic number.

135731291 is a deficient number, since it is larger than the sum of its proper divisors (111493).

135731291 is a wasteful number, since it uses less digits than its factorization.

135731291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111492.

The product of its digits is 5670, while the sum is 32.

The square root of 135731291 is about 11650.3772900280. The cubic root of 135731291 is about 513.9174053622.

The spelling of 135731291 in words is "one hundred thirty-five million, seven hundred thirty-one thousand, two hundred ninety-one".