171628049 has 4 divisors (see below), whose sum is σ = 171811380. Its totient is φ = 171444720.

The previous prime is 171628031. The next prime is 171628057. The reversal of 171628049 is 940826171.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 940826171 = 193 ⋅4874747.

It can be written as a sum of positive squares in 2 ways, for example, as 141729025 + 29899024 = 11905^2 + 5468^2 .

It is a cyclic number.

It is not a de Polignac number, because 171628049 - 2¹⁶ = 171562513 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (171628019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90254 + ... + 92135.

It is an arithmetic number, because the mean of its divisors is an integer number (42952845).

Almost surely, 2^171628049 is an apocalyptic number.

It is an amenable number.

171628049 is a deficient number, since it is larger than the sum of its proper divisors (183331).

171628049 is an equidigital number, since it uses as much as digits as its factorization.

171628049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183330.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 171628049 is about 13100.6888750172. The cubic root of 171628049 is about 555.7286093790.

The spelling of 171628049 in words is "one hundred seventy-one million, six hundred twenty-eight thousand, forty-nine".