52251621 has 4 divisors (see below), whose sum is σ = 69668832. Its totient is φ = 34834412.

The previous prime is 52251601. The next prime is 52251637. The reversal of 52251621 is 12615225.

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 52251621 - 2⁹ = 52251109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 52251591 and 52251600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52251601) 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, 8708601 + ... + 8708606.

It is an arithmetic number, because the mean of its divisors is an integer number (17417208).

Almost surely, 2^52251621 is an apocalyptic number.

It is an amenable number.

52251621 is a deficient number, since it is larger than the sum of its proper divisors (17417211).

52251621 is a wasteful number, since it uses less digits than its factorization.

52251621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17417210.

The product of its digits is 1200, while the sum is 24.

The square root of 52251621 is about 7228.5282734454. The cubic root of 52251621 is about 373.8521845258.

Adding to 52251621 its reverse (12615225), we get a palindrome (64866846).

The spelling of 52251621 in words is "fifty-two million, two hundred fifty-one thousand, six hundred twenty-one".