161822985 has 8 divisors (see below), whose sum is σ = 258916800. Its totient is φ = 86305584.

The previous prime is 161822971. The next prime is 161822993. The reversal of 161822985 is 589228161.

It is a happy number.

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

It is not a de Polignac number, because 161822985 - 2⁵ = 161822953 is a prime.

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, 5394085 + ... + 5394114.

It is an arithmetic number, because the mean of its divisors is an integer number (32364600).

Almost surely, 2^161822985 is an apocalyptic number.

161822985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161822985 is a deficient number, since it is larger than the sum of its proper divisors (97093815).

161822985 is a wasteful number, since it uses less digits than its factorization.

161822985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10788207.

The product of its digits is 69120, while the sum is 42.

The square root of 161822985 is about 12720.9663548018. The cubic root of 161822985 is about 544.9375514115.

The spelling of 161822985 in words is "one hundred sixty-one million, eight hundred twenty-two thousand, nine hundred eighty-five".