165241691 has 4 divisors (see below), whose sum is σ = 165370392. Its totient is φ = 165112992.

The previous prime is 165241673. The next prime is 165241721. The reversal of 165241691 is 196142561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 196142561 = 89 ⋅2203849.

It is a cyclic number.

It is not a de Polignac number, because 165241691 - 2¹⁰ = 165240667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165241621) 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, 62405 + ... + 64998.

It is an arithmetic number, because the mean of its divisors is an integer number (41342598).

Almost surely, 2^165241691 is an apocalyptic number.

165241691 is a deficient number, since it is larger than the sum of its proper divisors (128701).

165241691 is a wasteful number, since it uses less digits than its factorization.

165241691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128700.

The product of its digits is 12960, while the sum is 35.

The square root of 165241691 is about 12854.6369454761. The cubic root of 165241691 is about 548.7483283037.

The spelling of 165241691 in words is "one hundred sixty-five million, two hundred forty-one thousand, six hundred ninety-one".