55821263 has 2 divisors, whose sum is σ = 55821264. Its totient is φ = 55821262.

The previous prime is 55821247. The next prime is 55821277. The reversal of 55821263 is 36212855.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55821263 - 2⁴ = 55821247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55821203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27910631 + 27910632.

It is an arithmetic number, because the mean of its divisors is an integer number (27910632).

Almost surely, 2^55821263 is an apocalyptic number.

55821263 is a deficient number, since it is larger than the sum of its proper divisors (1).

55821263 is an equidigital number, since it uses as much as digits as its factorization.

55821263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14400, while the sum is 32.

The square root of 55821263 is about 7471.3628609511. The cubic root of 55821263 is about 382.1787651371.

The spelling of 55821263 in words is "fifty-five million, eight hundred twenty-one thousand, two hundred sixty-three".