161013217 has 4 divisors (see below), whose sum is σ = 161977536. Its totient is φ = 160048900.

The previous prime is 161013187. The next prime is 161013227. The reversal of 161013217 is 712310161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161013217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161013227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 481909 + ... + 482242.

It is an arithmetic number, because the mean of its divisors is an integer number (40494384).

Almost surely, 2^161013217 is an apocalyptic number.

It is an amenable number.

161013217 is a deficient number, since it is larger than the sum of its proper divisors (964319).

161013217 is an equidigital number, since it uses as much as digits as its factorization.

161013217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964318.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 161013217 is about 12689.0983525229. The cubic root of 161013217 is about 544.0270686952.

Adding to 161013217 its reverse (712310161), we get a palindrome (873323378).

The spelling of 161013217 in words is "one hundred sixty-one million, thirteen thousand, two hundred seventeen".