159121243 has 2 divisors, whose sum is σ = 159121244. Its totient is φ = 159121242.

The previous prime is 159121229. The next prime is 159121271. The reversal of 159121243 is 342121951.

It is an a-pointer prime, because the next prime (159121271) can be obtained adding 159121243 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-159121243 is a prime.

It is a super-3 number, since 3×159121243³ (a number of 26 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (159121213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79560621 + 79560622.

It is an arithmetic number, because the mean of its divisors is an integer number (79560622).

Almost surely, 2^159121243 is an apocalyptic number.

159121243 is a deficient number, since it is larger than the sum of its proper divisors (1).

159121243 is an equidigital number, since it uses as much as digits as its factorization.

159121243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 28.

The square root of 159121243 is about 12614.3268944482. The cubic root of 159121243 is about 541.8878175887.

The spelling of 159121243 in words is "one hundred fifty-nine million, one hundred twenty-one thousand, two hundred forty-three".