161650987 has 8 divisors (see below), whose sum is σ = 166863312. Its totient is φ = 156499200.

The previous prime is 161650963. The next prime is 161651003. The reversal of 161650987 is 789056161.

It is a happy number.

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 161650987 - 2¹¹ = 161648939 is a prime.

It is a super-2 number, since 2×161650987² = 52262083196148338, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161650927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9678 + ... + 20419.

It is an arithmetic number, because the mean of its divisors is an integer number (20857914).

Almost surely, 2^161650987 is an apocalyptic number.

161650987 is a deficient number, since it is larger than the sum of its proper divisors (5212325).

161650987 is a wasteful number, since it uses less digits than its factorization.

161650987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30269.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 161650987 is about 12714.2041433980. The cubic root of 161650987 is about 544.7444156923.

The spelling of 161650987 in words is "one hundred sixty-one million, six hundred fifty thousand, nine hundred eighty-seven".