161218159 has 2 divisors, whose sum is σ = 161218160. Its totient is φ = 161218158.

The previous prime is 161218153. The next prime is 161218193. The reversal of 161218159 is 951812161.

It is an a-pointer prime, because the next prime (161218193) can be obtained adding 161218159 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161218159 - 2²¹ = 159121007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161218153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80609079 + 80609080.

It is an arithmetic number, because the mean of its divisors is an integer number (80609080).

Almost surely, 2^161218159 is an apocalyptic number.

161218159 is a deficient number, since it is larger than the sum of its proper divisors (1).

161218159 is an equidigital number, since it uses as much as digits as its factorization.

161218159 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 34.

The square root of 161218159 is about 12697.1712991516. The cubic root of 161218159 is about 544.2577883153.

The spelling of 161218159 in words is "one hundred sixty-one million, two hundred eighteen thousand, one hundred fifty-nine".