55921777 has 2 divisors, whose sum is σ = 55921778. Its totient is φ = 55921776.

The previous prime is 55921753. The next prime is 55921841. The reversal of 55921777 is 77712955.

55921777 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29203216 + 26718561 = 5404^2 + 5169^2 .

It is a cyclic number.

It is not a de Polignac number, because 55921777 - 2²³ = 47533169 is a prime.

It is not a weakly prime, because it can be changed into another prime (55921727) 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, 27960888 + 27960889.

It is an arithmetic number, because the mean of its divisors is an integer number (27960889).

Almost surely, 2^55921777 is an apocalyptic number.

It is an amenable number.

55921777 is a deficient number, since it is larger than the sum of its proper divisors (1).

55921777 is an equidigital number, since it uses as much as digits as its factorization.

55921777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 154350, while the sum is 43.

The square root of 55921777 is about 7478.0864530975. The cubic root of 55921777 is about 382.4080163853.

The spelling of 55921777 in words is "fifty-five million, nine hundred twenty-one thousand, seven hundred seventy-seven".