161752217 has 8 divisors (see below), whose sum is σ = 179448480. Its totient is φ = 144554560.

The previous prime is 161752193. The next prime is 161752219. The reversal of 161752217 is 712257161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161752217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161752219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123968 + ... + 125265.

It is an arithmetic number, because the mean of its divisors is an integer number (22431060).

Almost surely, 2^161752217 is an apocalyptic number.

It is an amenable number.

161752217 is a deficient number, since it is larger than the sum of its proper divisors (17696263).

161752217 is a wasteful number, since it uses less digits than its factorization.

161752217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249303.

The product of its digits is 5880, while the sum is 32.

The square root of 161752217 is about 12718.1845009419. The cubic root of 161752217 is about 544.8581029459.

The spelling of 161752217 in words is "one hundred sixty-one million, seven hundred fifty-two thousand, two hundred seventeen".