161753217 has 16 divisors (see below), whose sum is σ = 218466048. Its totient is φ = 106444800.

The previous prime is 161753201. The next prime is 161753219. The reversal of 161753217 is 712357161.

It is not a de Polignac number, because 161753217 - 2⁴ = 161753201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161753219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139713 + ... + 140865.

It is an arithmetic number, because the mean of its divisors is an integer number (13654128).

Almost surely, 2^161753217 is an apocalyptic number.

It is an amenable number.

161753217 is a deficient number, since it is larger than the sum of its proper divisors (56712831).

161753217 is a wasteful number, since it uses less digits than its factorization.

161753217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1720.

The product of its digits is 8820, while the sum is 33.

The square root of 161753217 is about 12718.2238146685. The cubic root of 161753217 is about 544.8592257682.

It can be divided in two parts, 161 and 753217, that added together give a triangular number (753378 = T₁₂₂₇).

The spelling of 161753217 in words is "one hundred sixty-one million, seven hundred fifty-three thousand, two hundred seventeen".