55889021 has 2 divisors, whose sum is σ = 55889022. Its totient is φ = 55889020.

The previous prime is 55888957. The next prime is 55889023. The reversal of 55889021 is 12098855.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45091225 + 10797796 = 6715^2 + 3286^2 .

It is a cyclic number.

It is not a de Polignac number, because 55889021 - 2⁶ = 55888957 is a prime.

Together with 55889023, 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 (55889023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27944510 + 27944511.

It is an arithmetic number, because the mean of its divisors is an integer number (27944511).

Almost surely, 2^55889021 is an apocalyptic number.

It is an amenable number.

55889021 is a deficient number, since it is larger than the sum of its proper divisors (1).

55889021 is an equidigital number, since it uses as much as digits as its factorization.

55889021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 38.

The square root of 55889021 is about 7475.8959998117. The cubic root of 55889021 is about 382.3333370494. Note that the first 5 decimals are identical.

The spelling of 55889021 in words is "fifty-five million, eight hundred eighty-nine thousand, twenty-one".