165135917 has 4 divisors (see below), whose sum is σ = 165863616. Its totient is φ = 164408220.

The previous prime is 165135911. The next prime is 165135923. The reversal of 165135917 is 719531561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (165135911) and next prime (165135923).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165135917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165135911) 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, 363509 + ... + 363962.

It is an arithmetic number, because the mean of its divisors is an integer number (41465904).

Almost surely, 2^165135917 is an apocalyptic number.

It is an amenable number.

165135917 is a deficient number, since it is larger than the sum of its proper divisors (727699).

165135917 is an equidigital number, since it uses as much as digits as its factorization.

165135917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727698.

The product of its digits is 28350, while the sum is 38.

The square root of 165135917 is about 12850.5220516522. The cubic root of 165135917 is about 548.6312156175.

The spelling of 165135917 in words is "one hundred sixty-five million, one hundred thirty-five thousand, nine hundred seventeen".