55583621 has 4 divisors (see below), whose sum is σ = 55651500. Its totient is φ = 55515744.

The previous prime is 55583609. The next prime is 55583677. The reversal of 55583621 is 12638555.

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 26152996 + 29430625 = 5114^2 + 5425^2 .

It is a cyclic number.

It is not a de Polignac number, because 55583621 - 2¹⁸ = 55321477 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 (55583321) 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, 32696 + ... + 34353.

It is an arithmetic number, because the mean of its divisors is an integer number (13912875).

Almost surely, 2^55583621 is an apocalyptic number.

It is an amenable number.

55583621 is a deficient number, since it is larger than the sum of its proper divisors (67879).

55583621 is an equidigital number, since it uses as much as digits as its factorization.

55583621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67878.

The product of its digits is 36000, while the sum is 35.

The square root of 55583621 is about 7455.4423745342. The cubic root of 55583621 is about 381.6356571956.

The spelling of 55583621 in words is "fifty-five million, five hundred eighty-three thousand, six hundred twenty-one".