158609729 has 4 divisors (see below), whose sum is σ = 164079060. Its totient is φ = 153140400.

The previous prime is 158609723. The next prime is 158609743. The reversal of 158609729 is 927906851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 927906851 = 14557 ⋅63743.

It can be written as a sum of positive squares in 2 ways, for example, as 126517504 + 32092225 = 11248^2 + 5665^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158609729 is a prime.

It is a super-3 number, since 3×158609729³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158609723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2734622 + ... + 2734679.

It is an arithmetic number, because the mean of its divisors is an integer number (41019765).

Almost surely, 2^158609729 is an apocalyptic number.

It is an amenable number.

158609729 is a deficient number, since it is larger than the sum of its proper divisors (5469331).

158609729 is an equidigital number, since it uses as much as digits as its factorization.

158609729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5469330.

The product of its (nonzero) digits is 272160, while the sum is 47.

The square root of 158609729 is about 12594.0354533406. The cubic root of 158609729 is about 541.3065401842.

The spelling of 158609729 in words is "one hundred fifty-eight million, six hundred nine thousand, seven hundred twenty-nine".