161938717 has 4 divisors (see below), whose sum is σ = 164219616. Its totient is φ = 159657820.

The previous prime is 161938681. The next prime is 161938739. The reversal of 161938717 is 717839161.

It is a happy number.

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 not a de Polignac number, because 161938717 - 2¹¹ = 161936669 is a prime.

It is a super-3 number, since 3×161938717³ (a number of 26 digits) contains 333 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 (161936717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1140343 + ... + 1140484.

It is an arithmetic number, because the mean of its divisors is an integer number (41054904).

Almost surely, 2^161938717 is an apocalyptic number.

It is an amenable number.

161938717 is a deficient number, since it is larger than the sum of its proper divisors (2280899).

161938717 is an equidigital number, since it uses as much as digits as its factorization.

161938717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2280898.

The product of its digits is 63504, while the sum is 43.

The square root of 161938717 is about 12725.5144100347. The cubic root of 161938717 is about 545.0674293026.

The spelling of 161938717 in words is "one hundred sixty-one million, nine hundred thirty-eight thousand, seven hundred seventeen".