56819221 has 2 divisors, whose sum is σ = 56819222. Its totient is φ = 56819220.

The previous prime is 56819209. The next prime is 56819239. The reversal of 56819221 is 12291865.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43758225 + 13060996 = 6615^2 + 3614^2 .

It is a cyclic number.

It is not a de Polignac number, because 56819221 - 2⁷ = 56819093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56819201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28409610 + 28409611.

It is an arithmetic number, because the mean of its divisors is an integer number (28409611).

Almost surely, 2^56819221 is an apocalyptic number.

It is an amenable number.

56819221 is a deficient number, since it is larger than the sum of its proper divisors (1).

56819221 is an equidigital number, since it uses as much as digits as its factorization.

56819221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 34.

The square root of 56819221 is about 7537.8525456525. The cubic root of 56819221 is about 384.4428236542.

The spelling of 56819221 in words is "fifty-six million, eight hundred nineteen thousand, two hundred twenty-one".