161216343 has 6 divisors (see below), whose sum is σ = 232868064. Its totient is φ = 107477556.

The previous prime is 161216323. The next prime is 161216353. The reversal of 161216343 is 343612161.

161216343 is a `hidden beast` number, since 1 + 6 + 1 + 21 + 634 + 3 = 666.

It is not a de Polignac number, because 161216343 - 2¹⁰ = 161215319 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161216303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8956455 + ... + 8956472.

It is an arithmetic number, because the mean of its divisors is an integer number (38811344).

Almost surely, 2^161216343 is an apocalyptic number.

161216343 is a deficient number, since it is larger than the sum of its proper divisors (71651721).

161216343 is a wasteful number, since it uses less digits than its factorization.

161216343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17912933 (or 17912930 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 161216343 is about 12697.0997869592. The cubic root of 161216343 is about 544.2557447575.

It can be divided in two parts, 1612 and 16343, that added together give a triangular number (17955 = T₁₈₉).

The spelling of 161216343 in words is "one hundred sixty-one million, two hundred sixteen thousand, three hundred forty-three".