159993481 has 2 divisors, whose sum is σ = 159993482. Its totient is φ = 159993480.

The previous prime is 159993479. The next prime is 159993527. The reversal of 159993481 is 184399951.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102839881 + 57153600 = 10141^2 + 7560^2 .

It is a cyclic number.

It is not a de Polignac number, because 159993481 - 2¹ = 159993479 is a prime.

It is a super-2 number, since 2×159993481² = 51195827924994722, which contains 22 as substring.

Together with 159993479, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (159999481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79996740 + 79996741.

It is an arithmetic number, because the mean of its divisors is an integer number (79996741).

Almost surely, 2^159993481 is an apocalyptic number.

It is an amenable number.

159993481 is a deficient number, since it is larger than the sum of its proper divisors (1).

159993481 is an equidigital number, since it uses as much as digits as its factorization.

159993481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 49.

The square root of 159993481 is about 12648.8529519479. The cubic root of 159993481 is about 542.8761501820.

The spelling of 159993481 in words is "one hundred fifty-nine million, nine hundred ninety-three thousand, four hundred eighty-one".