159749 has 4 divisors (see below), whose sum is σ = 169164. Its totient is φ = 150336.

The previous prime is 159739. The next prime is 159763. The reversal of 159749 is 947951.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 947951 = 547 ⋅1733.

It can be written as a sum of positive squares in 2 ways, for example, as 47524 + 112225 = 218^2 + 335^2 .

It is a cyclic number.

It is not a de Polignac number, because 159749 - 2¹² = 155653 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (159739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4682 + ... + 4715.

It is an arithmetic number, because the mean of its divisors is an integer number (42291).

2¹⁵⁹⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

159749 is a deficient number, since it is larger than the sum of its proper divisors (9415).

159749 is an equidigital number, since it uses as much as digits as its factorization.

159749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9414.

The product of its digits is 11340, while the sum is 35.

The square root of 159749 is about 399.6861268546. The cubic root of 159749 is about 54.2599491900.

The spelling of 159749 in words is "one hundred fifty-nine thousand, seven hundred forty-nine".