53139173 has 4 divisors (see below), whose sum is σ = 53779488. Its totient is φ = 52498860.

The previous prime is 53139167. The next prime is 53139209. The reversal of 53139173 is 37193135.

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 53139173 - 2¹⁴ = 53122789 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 (53130173) 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, 320033 + ... + 320198.

It is an arithmetic number, because the mean of its divisors is an integer number (13444872).

Almost surely, 2^53139173 is an apocalyptic number.

It is an amenable number.

53139173 is a deficient number, since it is larger than the sum of its proper divisors (640315).

53139173 is an equidigital number, since it uses as much as digits as its factorization.

53139173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640314.

The product of its digits is 8505, while the sum is 32.

The square root of 53139173 is about 7289.6620634979. The cubic root of 53139173 is about 375.9570764529.

The spelling of 53139173 in words is "fifty-three million, one hundred thirty-nine thousand, one hundred seventy-three".