161843887 has 2 divisors, whose sum is σ = 161843888. Its totient is φ = 161843886.

The previous prime is 161843863. The next prime is 161843977. The reversal of 161843887 is 788348161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161843887 - 2¹¹ = 161841839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161843807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80921943 + 80921944.

It is an arithmetic number, because the mean of its divisors is an integer number (80921944).

Almost surely, 2^161843887 is an apocalyptic number.

161843887 is a deficient number, since it is larger than the sum of its proper divisors (1).

161843887 is an equidigital number, since it uses as much as digits as its factorization.

161843887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 258048, while the sum is 46.

The square root of 161843887 is about 12721.7878853564. The cubic root of 161843887 is about 544.9610128383.

The spelling of 161843887 in words is "one hundred sixty-one million, eight hundred forty-three thousand, eight hundred eighty-seven".