53172309 has 8 divisors (see below), whose sum is σ = 71051392. Its totient is φ = 35370720.

The previous prime is 53172247. The next prime is 53172313. The reversal of 53172309 is 90327135.

53172309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 53172309 - 2²⁰ = 52123733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53172349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17752 + ... + 20529.

It is an arithmetic number, because the mean of its divisors is an integer number (8881424).

Almost surely, 2^53172309 is an apocalyptic number.

It is an amenable number.

53172309 is a deficient number, since it is larger than the sum of its proper divisors (17879083).

53172309 is a wasteful number, since it uses less digits than its factorization.

53172309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38747.

The product of its (nonzero) digits is 5670, while the sum is 30.

The square root of 53172309 is about 7291.9345169852. The cubic root of 53172309 is about 376.0352054141.

It can be divided in two parts, 5317 and 2309, that added together give a triangular number (7626 = T₁₂₃).

The spelling of 53172309 in words is "fifty-three million, one hundred seventy-two thousand, three hundred nine".