161285638 has 8 divisors (see below), whose sum is σ = 241983000. Its totient is φ = 80624640.

The previous prime is 161285633. The next prime is 161285639. The reversal of 161285638 is 836582161.

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

It is a self number, because there is not a number n which added to its sum of digits gives 161285638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161285633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10113 + ... + 20611.

It is an arithmetic number, because the mean of its divisors is an integer number (30247875).

Almost surely, 2^161285638 is an apocalyptic number.

161285638 is a deficient number, since it is larger than the sum of its proper divisors (80697362).

161285638 is a wasteful number, since it uses less digits than its factorization.

161285638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18182.

The product of its digits is 69120, while the sum is 40.

The square root of 161285638 is about 12699.8282665554. The cubic root of 161285638 is about 544.3337120382. Note that the first 3 decimals are identical.

The spelling of 161285638 in words is "one hundred sixty-one million, two hundred eighty-five thousand, six hundred thirty-eight".