165171154 has 4 divisors (see below), whose sum is σ = 247756734. Its totient is φ = 82585576.

The previous prime is 165171151. The next prime is 165171163. The reversal of 165171154 is 451171561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 103124025 + 62047129 = 10155^2 + 7877^2 .

It is a super-2 number, since 2×165171154² = 54563020227383432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (165171151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41292787 + ... + 41292790.

Almost surely, 2^165171154 is an apocalyptic number.

165171154 is a deficient number, since it is larger than the sum of its proper divisors (82585580).

165171154 is an equidigital number, since it uses as much as digits as its factorization.

165171154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82585579.

The product of its digits is 4200, while the sum is 31.

The square root of 165171154 is about 12851.8930123153. The cubic root of 165171154 is about 548.6702354819.

It can be divided in two parts, 16517 and 1154, that added together give a palindrome (17671).

The spelling of 165171154 in words is "one hundred sixty-five million, one hundred seventy-one thousand, one hundred fifty-four".