52561621 has 8 divisors (see below), whose sum is σ = 60654464. Its totient is φ = 44614800.

The previous prime is 52561591. The next prime is 52561627. The reversal of 52561621 is 12616525.

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

It is a 4-Lehmer number, since φ(52561621) divides (52561621-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 52561621 - 2⁵ = 52561589 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 52561621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52561627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35730 + ... + 37171.

It is an arithmetic number, because the mean of its divisors is an integer number (7581808).

Almost surely, 2^52561621 is an apocalyptic number.

It is an amenable number.

52561621 is a deficient number, since it is larger than the sum of its proper divisors (8092843).

52561621 is a wasteful number, since it uses less digits than its factorization.

52561621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73011.

The product of its digits is 3600, while the sum is 28.

The square root of 52561621 is about 7249.9393790569. The cubic root of 52561621 is about 374.5900610672.

The spelling of 52561621 in words is "fifty-two million, five hundred sixty-one thousand, six hundred twenty-one".