165470909 has 4 divisors (see below), whose sum is σ = 165518016. Its totient is φ = 165423804.

The previous prime is 165470891. The next prime is 165470939. The reversal of 165470909 is 909074561.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165470909 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165470939) 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 3 ways as a sum of consecutive naturals, for example, 17819 + ... + 25464.

It is an arithmetic number, because the mean of its divisors is an integer number (41379504).

Almost surely, 2^165470909 is an apocalyptic number.

It is an amenable number.

165470909 is a deficient number, since it is larger than the sum of its proper divisors (47107).

165470909 is an equidigital number, since it uses as much as digits as its factorization.

165470909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47106.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 165470909 is about 12863.5496267554. The cubic root of 165470909 is about 549.0019464587.

The spelling of 165470909 in words is "one hundred sixty-five million, four hundred seventy thousand, nine hundred nine".