55205261 has 2 divisors, whose sum is σ = 55205262. Its totient is φ = 55205260.

The previous prime is 55205251. The next prime is 55205281. The reversal of 55205261 is 16250255.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55204900 + 361 = 7430^2 + 19^2 .

It is a cyclic number.

It is not a de Polignac number, because 55205261 - 2⁶ = 55205197 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55205261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55205201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27602630 + 27602631.

It is an arithmetic number, because the mean of its divisors is an integer number (27602631).

Almost surely, 2^55205261 is an apocalyptic number.

It is an amenable number.

55205261 is a deficient number, since it is larger than the sum of its proper divisors (1).

55205261 is an equidigital number, since it uses as much as digits as its factorization.

55205261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 55205261 is about 7430.0242933654. The cubic root of 55205261 is about 380.7677483579.

The spelling of 55205261 in words is "fifty-five million, two hundred five thousand, two hundred sixty-one".