52171921 has 4 divisors (see below), whose sum is σ = 52388644. Its totient is φ = 51955200.

The previous prime is 52171919. The next prime is 52171937. The reversal of 52171921 is 12917125.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47761921 + 4410000 = 6911^2 + 2100^2 .

It is a cyclic number.

It is not a de Polignac number, because 52171921 - 2¹ = 52171919 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 52171921.

It is not an unprimeable number, because it can be changed into a prime (52171121) 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, 108000 + ... + 108481.

It is an arithmetic number, because the mean of its divisors is an integer number (13097161).

Almost surely, 2^52171921 is an apocalyptic number.

It is an amenable number.

52171921 is a deficient number, since it is larger than the sum of its proper divisors (216723).

52171921 is a wasteful number, since it uses less digits than its factorization.

52171921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216722.

The product of its digits is 1260, while the sum is 28.

The square root of 52171921 is about 7223.0132908641. The cubic root of 52171921 is about 373.6620074506.

The spelling of 52171921 in words is "fifty-two million, one hundred seventy-one thousand, nine hundred twenty-one".