161316243 has 12 divisors (see below), whose sum is σ = 254195448. Its totient is φ = 97767360.

The previous prime is 161316229. The next prime is 161316283. The reversal of 161316243 is 342613161.

161316243 is a `hidden beast` number, since 1 + 6 + 1 + 31 + 624 + 3 = 666.

It is not a de Polignac number, because 161316243 - 2¹³ = 161308051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161316283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 814630 + ... + 814827.

It is an arithmetic number, because the mean of its divisors is an integer number (21182954).

Almost surely, 2^161316243 is an apocalyptic number.

161316243 is a deficient number, since it is larger than the sum of its proper divisors (92879205).

161316243 is a wasteful number, since it uses less digits than its factorization.

161316243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1629474 (or 1629471 counting only the distinct ones).

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

The square root of 161316243 is about 12701.0331469530. The cubic root of 161316243 is about 544.3681401494.

The spelling of 161316243 in words is "one hundred sixty-one million, three hundred sixteen thousand, two hundred forty-three".