161788211 has 8 divisors (see below), whose sum is σ = 183403920. Its totient is φ = 141482592.

The previous prime is 161788189. The next prime is 161788229. The reversal of 161788211 is 112887161.

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 161788211 - 2¹⁰ = 161787187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161788261) 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, 327260 + ... + 327753.

It is an arithmetic number, because the mean of its divisors is an integer number (22925490).

Almost surely, 2^161788211 is an apocalyptic number.

161788211 is a deficient number, since it is larger than the sum of its proper divisors (21615709).

161788211 is a wasteful number, since it uses less digits than its factorization.

161788211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655045.

The product of its digits is 5376, while the sum is 35.

The square root of 161788211 is about 12719.5994826881. The cubic root of 161788211 is about 544.8985148970.

It can be divided in two parts, 16178 and 8211, that added together give a cube (24389 = 29³).

The spelling of 161788211 in words is "one hundred sixty-one million, seven hundred eighty-eight thousand, two hundred eleven".