161938319 has 4 divisors (see below), whose sum is σ = 162102720. Its totient is φ = 161773920.

The previous prime is 161938313. The next prime is 161938367. The reversal of 161938319 is 913839161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161938319 - 2²⁴ = 145161103 is a prime.

It is a super-2 number, since 2×161938319² = 52448038321091522, 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 (161938313) 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, 80714 + ... + 82695.

It is an arithmetic number, because the mean of its divisors is an integer number (40525680).

Almost surely, 2^161938319 is an apocalyptic number.

161938319 is a deficient number, since it is larger than the sum of its proper divisors (164401).

161938319 is an equidigital number, since it uses as much as digits as its factorization.

161938319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164400.

The product of its digits is 34992, while the sum is 41.

The square root of 161938319 is about 12725.4987721503. The cubic root of 161938319 is about 545.0669827612.

The spelling of 161938319 in words is "one hundred sixty-one million, nine hundred thirty-eight thousand, three hundred nineteen".