161223687 has 12 divisors (see below), whose sum is σ = 232997544. Its totient is φ = 107427600.

The previous prime is 161223661. The next prime is 161223697. The reversal of 161223687 is 786322161.

161223687 is a `hidden beast` number, since 1 + 612 + 2 + 36 + 8 + 7 = 666.

It is not a de Polignac number, because 161223687 - 2⁸ = 161223431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161223697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22437 + ... + 28737.

It is an arithmetic number, because the mean of its divisors is an integer number (19416462).

Almost surely, 2^161223687 is an apocalyptic number.

161223687 is a deficient number, since it is larger than the sum of its proper divisors (71773857).

161223687 is a wasteful number, since it uses less digits than its factorization.

161223687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9150 (or 9147 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 161223687 is about 12697.3889835667. The cubic root of 161223687 is about 544.2640089186.

The spelling of 161223687 in words is "one hundred sixty-one million, two hundred twenty-three thousand, six hundred eighty-seven".