161308405 has 8 divisors (see below), whose sum is σ = 194544000. Its totient is φ = 128397456.

The previous prime is 161308387. The next prime is 161308417. The reversal of 161308405 is 504803161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161308405 - 2¹⁷ = 161177333 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80065 + ... + 82054.

It is an arithmetic number, because the mean of its divisors is an integer number (24318000).

Almost surely, 2^161308405 is an apocalyptic number.

It is an amenable number.

161308405 is a deficient number, since it is larger than the sum of its proper divisors (33235595).

161308405 is a wasteful number, since it uses less digits than its factorization.

161308405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162323.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 161308405 is about 12700.7245856290. The cubic root of 161308405 is about 544.3593234580.

The spelling of 161308405 in words is "one hundred sixty-one million, three hundred eight thousand, four hundred five".