55405247 has 2 divisors, whose sum is σ = 55405248. Its totient is φ = 55405246.

The previous prime is 55405223. The next prime is 55405249. The reversal of 55405247 is 74250455.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55405247 - 2¹⁴ = 55388863 is a prime.

Together with 55405249, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55405249) 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 as a sum of consecutive naturals, namely, 27702623 + 27702624.

It is an arithmetic number, because the mean of its divisors is an integer number (27702624).

Almost surely, 2^55405247 is an apocalyptic number.

55405247 is a deficient number, since it is larger than the sum of its proper divisors (1).

55405247 is an equidigital number, since it uses as much as digits as its factorization.

55405247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28000, while the sum is 32.

The square root of 55405247 is about 7443.4700912948. The cubic root of 55405247 is about 381.2269826828.

The spelling of 55405247 in words is "fifty-five million, four hundred five thousand, two hundred forty-seven".