161604719 has 4 divisors (see below), whose sum is σ = 162275520. Its totient is φ = 160933920.

The previous prime is 161604713. The next prime is 161604721. The reversal of 161604719 is 917406161.

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 161604719 - 2²⁴ = 144827503 is a prime.

It is a super-2 number, since 2×161604719² = 52232170406137922, 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 (161604713) 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, 335039 + ... + 335520.

It is an arithmetic number, because the mean of its divisors is an integer number (40568880).

Almost surely, 2^161604719 is an apocalyptic number.

161604719 is a deficient number, since it is larger than the sum of its proper divisors (670801).

161604719 is an equidigital number, since it uses as much as digits as its factorization.

161604719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670800.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 161604719 is about 12712.3844734180. The cubic root of 161604719 is about 544.6924381982.

The spelling of 161604719 in words is "one hundred sixty-one million, six hundred four thousand, seven hundred nineteen".