159987551 has 2 divisors, whose sum is σ = 159987552. Its totient is φ = 159987550.

The previous prime is 159987539. The next prime is 159987571. The reversal of 159987551 is 155789951.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-159987551 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 159987551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (159987571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79993775 + 79993776.

It is an arithmetic number, because the mean of its divisors is an integer number (79993776).

Almost surely, 2^159987551 is an apocalyptic number.

159987551 is a deficient number, since it is larger than the sum of its proper divisors (1).

159987551 is an equidigital number, since it uses as much as digits as its factorization.

159987551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 567000, while the sum is 50.

The square root of 159987551 is about 12648.6185411688. The cubic root of 159987551 is about 542.8694430434.

The spelling of 159987551 in words is "one hundred fifty-nine million, nine hundred eighty-seven thousand, five hundred fifty-one".