159818891 has 2 divisors, whose sum is σ = 159818892. Its totient is φ = 159818890.

The previous prime is 159818843. The next prime is 159818929. The reversal of 159818891 is 198818951.

It is a strong prime.

It is an emirp because it is prime and its reverse (198818951) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 159818891 - 2¹⁴ = 159802507 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (159848891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79909445 + 79909446.

It is an arithmetic number, because the mean of its divisors is an integer number (79909446).

Almost surely, 2^159818891 is an apocalyptic number.

159818891 is a deficient number, since it is larger than the sum of its proper divisors (1).

159818891 is an equidigital number, since it uses as much as digits as its factorization.

159818891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 50.

The square root of 159818891 is about 12641.9496518535. The cubic root of 159818891 is about 542.6786103753.

The spelling of 159818891 in words is "one hundred fifty-nine million, eight hundred eighteen thousand, eight hundred ninety-one".