161386317 has 16 divisors (see below), whose sum is σ = 242662080. Its totient is φ = 105983856.

The previous prime is 161386301. The next prime is 161386339. The reversal of 161386317 is 713683161.

161386317 is a `hidden beast` number, since 1 + 6 + 13 + 8 + 631 + 7 = 666.

It is not a de Polignac number, because 161386317 - 2⁴ = 161386301 is a prime.

It is a super-4 number, since 4×161386317⁴ (a number of 34 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161386387) 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, 42798 + ... + 46415.

It is an arithmetic number, because the mean of its divisors is an integer number (15166380).

Almost surely, 2^161386317 is an apocalyptic number.

It is an amenable number.

161386317 is a deficient number, since it is larger than the sum of its proper divisors (81275763).

161386317 is an equidigital number, since it uses as much as digits as its factorization.

161386317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89289 (or 89283 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 161386317 is about 12703.7914419279. The cubic root of 161386317 is about 544.4469512480.

The spelling of 161386317 in words is "one hundred sixty-one million, three hundred eighty-six thousand, three hundred seventeen".