165472891 has 4 divisors (see below), whose sum is σ = 165805000. Its totient is φ = 165140784.

The previous prime is 165472861. The next prime is 165472903. The reversal of 165472891 is 198274561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198274561 = 14081².

It is a cyclic number.

It is not a de Polignac number, because 165472891 - 2⁷ = 165472763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165472841) 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, 165306 + ... + 166303.

It is an arithmetic number, because the mean of its divisors is an integer number (41451250).

Almost surely, 2^165472891 is an apocalyptic number.

165472891 is a deficient number, since it is larger than the sum of its proper divisors (332109).

165472891 is an equidigital number, since it uses as much as digits as its factorization.

165472891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332108.

The product of its digits is 120960, while the sum is 43.

The square root of 165472891 is about 12863.6266659135. The cubic root of 165472891 is about 549.0041384200.

The spelling of 165472891 in words is "one hundred sixty-five million, four hundred seventy-two thousand, eight hundred ninety-one".