159987979 has 2 divisors, whose sum is σ = 159987980. Its totient is φ = 159987978.

The previous prime is 159987959. The next prime is 159988001. The reversal of 159987979 is 979789951.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 159987979 - 2⁷ = 159987851 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 159987979.

It is not a weakly prime, because it can be changed into another prime (159987959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79993989 + 79993990.

It is an arithmetic number, because the mean of its divisors is an integer number (79993990).

Almost surely, 2^159987979 is an apocalyptic number.

159987979 is a deficient number, since it is larger than the sum of its proper divisors (1).

159987979 is an equidigital number, since it uses as much as digits as its factorization.

159987979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12859560, while the sum is 64.

The square root of 159987979 is about 12648.6354600012. The cubic root of 159987979 is about 542.8699271392.

The spelling of 159987979 in words is "one hundred fifty-nine million, nine hundred eighty-seven thousand, nine hundred seventy-nine".