165051451 has 4 divisors (see below), whose sum is σ = 168563232. Its totient is φ = 161539672.

The previous prime is 165051437. The next prime is 165051493. The reversal of 165051451 is 154150561.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 154150561 = 191 ⋅807071.

It is a cyclic number.

It is not a de Polignac number, because 165051451 - 2⁹ = 165050939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165051401) 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, 1755820 + ... + 1755913.

It is an arithmetic number, because the mean of its divisors is an integer number (42140808).

Almost surely, 2^165051451 is an apocalyptic number.

165051451 is a deficient number, since it is larger than the sum of its proper divisors (3511781).

165051451 is an equidigital number, since it uses as much as digits as its factorization.

165051451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3511780.

The product of its (nonzero) digits is 3000, while the sum is 28.

The square root of 165051451 is about 12847.2351500235. The cubic root of 165051451 is about 548.5376591735.

It can be divided in two parts, 16505 and 1451, that added together give a square (17956 = 134²).

The spelling of 165051451 in words is "one hundred sixty-five million, fifty-one thousand, four hundred fifty-one".