164509729 has 4 divisors (see below), whose sum is σ = 168009984. Its totient is φ = 161009476.

The previous prime is 164509711. The next prime is 164509739. The reversal of 164509729 is 927905461.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 164509729 - 2⁷ = 164509601 is a prime.

It is a super-4 number, since 4×164509729⁴ (a number of 34 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164509739) 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, 1750057 + ... + 1750150.

It is an arithmetic number, because the mean of its divisors is an integer number (42002496).

Almost surely, 2^164509729 is an apocalyptic number.

It is an amenable number.

164509729 is a deficient number, since it is larger than the sum of its proper divisors (3500255).

164509729 is an equidigital number, since it uses as much as digits as its factorization.

164509729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3500254.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 164509729 is about 12826.1346086808. The cubic root of 164509729 is about 547.9368755765.

The spelling of 164509729 in words is "one hundred sixty-four million, five hundred nine thousand, seven hundred twenty-nine".