161228117 has 8 divisors (see below), whose sum is σ = 166636032. Its totient is φ = 155833200.

The previous prime is 161228107. The next prime is 161228141. The reversal of 161228117 is 711822161.

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

It is a cyclic number.

It is not a de Polignac number, because 161228117 - 2⁴ = 161228101 is a prime.

It is a super-2 number, since 2×161228117² = 51989011422731378, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161228117.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161228107) 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 7 ways as a sum of consecutive naturals, for example, 26408 + ... + 31934.

It is an arithmetic number, because the mean of its divisors is an integer number (20829504).

Almost surely, 2^161228117 is an apocalyptic number.

It is an amenable number.

161228117 is a deficient number, since it is larger than the sum of its proper divisors (5407915).

161228117 is an equidigital number, since it uses as much as digits as its factorization.

161228117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6499.

The product of its digits is 1344, while the sum is 29.

The square root of 161228117 is about 12697.5634276817. The cubic root of 161228117 is about 544.2689938509.

The spelling of 161228117 in words is "one hundred sixty-one million, two hundred twenty-eight thousand, one hundred seventeen".