55621259 has 2 divisors, whose sum is σ = 55621260. Its totient is φ = 55621258.

The previous prime is 55621211. The next prime is 55621261. The reversal of 55621259 is 95212655.

55621259 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55621259 is a prime.

Together with 55621261, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55621459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27810629 + 27810630.

It is an arithmetic number, because the mean of its divisors is an integer number (27810630).

Almost surely, 2^55621259 is an apocalyptic number.

55621259 is a deficient number, since it is larger than the sum of its proper divisors (1).

55621259 is an equidigital number, since it uses as much as digits as its factorization.

55621259 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27000, while the sum is 35.

The square root of 55621259 is about 7457.9661436614. The cubic root of 55621259 is about 381.7217782607.

The spelling of 55621259 in words is "fifty-five million, six hundred twenty-one thousand, two hundred fifty-nine".