165115491 has 8 divisors (see below), whose sum is σ = 231741120. Its totient is φ = 104283432.

The previous prime is 165115477. The next prime is 165115547. The reversal of 165115491 is 194511561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 165115491 - 2¹⁴ = 165099107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165115591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1448325 + ... + 1448438.

It is an arithmetic number, because the mean of its divisors is an integer number (28967640).

Almost surely, 2^165115491 is an apocalyptic number.

165115491 is a deficient number, since it is larger than the sum of its proper divisors (66625629).

165115491 is a wasteful number, since it uses less digits than its factorization.

165115491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2896785.

The product of its digits is 5400, while the sum is 33.

The square root of 165115491 is about 12849.7272733704. The cubic root of 165115491 is about 548.6085942450.

The spelling of 165115491 in words is "one hundred sixty-five million, one hundred fifteen thousand, four hundred ninety-one".