55847621 has 2 divisors, whose sum is σ = 55847622. Its totient is φ = 55847620.

The previous prime is 55847579. The next prime is 55847633. The reversal of 55847621 is 12674855.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49547521 + 6300100 = 7039^2 + 2510^2 .

It is a cyclic number.

It is not a de Polignac number, because 55847621 - 2⁶ = 55847557 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55847641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27923810 + 27923811.

It is an arithmetic number, because the mean of its divisors is an integer number (27923811).

Almost surely, 2^55847621 is an apocalyptic number.

It is an amenable number.

55847621 is a deficient number, since it is larger than the sum of its proper divisors (1).

55847621 is an equidigital number, since it uses as much as digits as its factorization.

55847621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 67200, while the sum is 38.

The square root of 55847621 is about 7473.1265879818. The cubic root of 55847621 is about 382.2389087828.

The spelling of 55847621 in words is "fifty-five million, eight hundred forty-seven thousand, six hundred twenty-one".