52166621 has 8 divisors (see below), whose sum is σ = 58117080. Its totient is φ = 46492992.

The previous prime is 52166617. The next prime is 52166629. The reversal of 52166621 is 12666125.

It can be written as a sum of positive squares in 4 ways, for example, as 168100 + 51998521 = 410^2 + 7211^2 .

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

It is not a de Polignac number, because 52166621 - 2² = 52166617 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52166629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68810 + ... + 69563.

It is an arithmetic number, because the mean of its divisors is an integer number (7264635).

Almost surely, 2^52166621 is an apocalyptic number.

It is an amenable number.

52166621 is a deficient number, since it is larger than the sum of its proper divisors (5950459).

52166621 is a wasteful number, since it uses less digits than its factorization.

52166621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138415.

The product of its digits is 4320, while the sum is 29.

The square root of 52166621 is about 7222.6463986547. The cubic root of 52166621 is about 373.6493539283.

The spelling of 52166621 in words is "fifty-two million, one hundred sixty-six thousand, six hundred twenty-one".