161704493 has 16 divisors (see below), whose sum is σ = 177986160. Its totient is φ = 146227200.

The previous prime is 161704489. The next prime is 161704507. The reversal of 161704493 is 394407161.

161704493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 2010724 + 159693769 = 1418^2 + 12637^2 .

It is not a de Polignac number, because 161704493 - 2² = 161704489 is a prime.

It is a super-2 number, since 2×161704493² = 52296686112774098, 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 (161704693) 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, 118133 + ... + 119493.

It is an arithmetic number, because the mean of its divisors is an integer number (11124135).

Almost surely, 2^161704493 is an apocalyptic number.

It is an amenable number.

161704493 is a deficient number, since it is larger than the sum of its proper divisors (16281667).

161704493 is a wasteful number, since it uses less digits than its factorization.

161704493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1648.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 161704493 is about 12716.3081513464. The cubic root of 161704493 is about 544.8045119940.

The spelling of 161704493 in words is "one hundred sixty-one million, seven hundred four thousand, four hundred ninety-three".