55570621 has 16 divisors (see below), whose sum is σ = 58529520. Its totient is φ = 52715520.

The previous prime is 55570609. The next prime is 55570639. The reversal of 55570621 is 12607555.

It can be written as a sum of positive squares in 8 ways, for example, as 16695396 + 38875225 = 4086^2 + 6235^2 .

It is a cyclic number.

It is not a de Polignac number, because 55570621 - 2²³ = 47182013 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 (55570601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 353875 + ... + 354031.

It is an arithmetic number, because the mean of its divisors is an integer number (3658095).

Almost surely, 2^55570621 is an apocalyptic number.

It is an amenable number.

55570621 is a deficient number, since it is larger than the sum of its proper divisors (2958899).

55570621 is a wasteful number, since it uses less digits than its factorization.

55570621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384.

The product of its (nonzero) digits is 10500, while the sum is 31.

The square root of 55570621 is about 7454.5704772307. The cubic root of 55570621 is about 381.6059023248.

The spelling of 55570621 in words is "fifty-five million, five hundred seventy thousand, six hundred twenty-one".