161642317 has 8 divisors (see below), whose sum is σ = 167398200. Its totient is φ = 155898624.

The previous prime is 161642311. The next prime is 161642323. The reversal of 161642317 is 713246161.

It is an interprime number because it is at equal distance from previous prime (161642311) and next prime (161642323).

It can be written as a sum of positive squares in 4 ways, for example, as 2604996 + 159037321 = 1614^2 + 12611^2 .

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 161642317 - 2³ = 161642309 is a prime.

It is a super-2 number, since 2×161642317² = 52256477290256978, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161642311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30273 + ... + 35209.

It is an arithmetic number, because the mean of its divisors is an integer number (20924775).

Almost surely, 2^161642317 is an apocalyptic number.

It is an amenable number.

161642317 is a deficient number, since it is larger than the sum of its proper divisors (5755883).

161642317 is a wasteful number, since it uses less digits than its factorization.

161642317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6095.

The product of its digits is 6048, while the sum is 31.

The square root of 161642317 is about 12713.8631815825. The cubic root of 161642317 is about 544.7346765652.

Adding to 161642317 its reverse (713246161), we get a palindrome (874888478).

It can be divided in two parts, 16164 and 2317, that added together give a palindrome (18481).

The spelling of 161642317 in words is "one hundred sixty-one million, six hundred forty-two thousand, three hundred seventeen".