55855871 has 2 divisors, whose sum is σ = 55855872. Its totient is φ = 55855870.

The previous prime is 55855867. The next prime is 55855873. The reversal of 55855871 is 17855855.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55855871 - 2² = 55855867 is a prime.

Together with 55855873, 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 (55855873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27927935 + 27927936.

It is an arithmetic number, because the mean of its divisors is an integer number (27927936).

Almost surely, 2^55855871 is an apocalyptic number.

55855871 is a deficient number, since it is larger than the sum of its proper divisors (1).

55855871 is an equidigital number, since it uses as much as digits as its factorization.

55855871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 280000, while the sum is 44.

The square root of 55855871 is about 7473.6785454019. The cubic root of 55855871 is about 382.2577297321.

The spelling of 55855871 in words is "fifty-five million, eight hundred fifty-five thousand, eight hundred seventy-one".