161843807 has 2 divisors, whose sum is σ = 161843808. Its totient is φ = 161843806.

The previous prime is 161843779. The next prime is 161843837. The reversal of 161843807 is 708348161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161843807 - 2¹⁶ = 161778271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161843837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80921903 + 80921904.

It is an arithmetic number, because the mean of its divisors is an integer number (80921904).

Almost surely, 2^161843807 is an apocalyptic number.

161843807 is a deficient number, since it is larger than the sum of its proper divisors (1).

161843807 is an equidigital number, since it uses as much as digits as its factorization.

161843807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 161843807 is about 12721.7847411438. The cubic root of 161843807 is about 544.9609230462.

It can be divided in two parts, 16184 and 3807, that added together give a palindrome (19991).

The spelling of 161843807 in words is "one hundred sixty-one million, eight hundred forty-three thousand, eight hundred seven".