161861822 has 8 divisors (see below), whose sum is σ = 245150256. Its totient is φ = 80145072.

The previous prime is 161861767. The next prime is 161861827. The reversal of 161861822 is 228168161.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161861827) 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, 392663 + ... + 393074.

It is an arithmetic number, because the mean of its divisors is an integer number (30643782).

Almost surely, 2^161861822 is an apocalyptic number.

161861822 is a deficient number, since it is larger than the sum of its proper divisors (83288434).

161861822 is a wasteful number, since it uses less digits than its factorization.

161861822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785842.

The product of its digits is 9216, while the sum is 35.

The square root of 161861822 is about 12722.4927588897. The cubic root of 161861822 is about 544.9811423489.

The spelling of 161861822 in words is "one hundred sixty-one million, eight hundred sixty-one thousand, eight hundred twenty-two".