55277791 has 2 divisors, whose sum is σ = 55277792. Its totient is φ = 55277790.

The previous prime is 55277777. The next prime is 55277839. The reversal of 55277791 is 19777255.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55277791 - 2⁵ = 55277759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55277291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27638895 + 27638896.

It is an arithmetic number, because the mean of its divisors is an integer number (27638896).

Almost surely, 2^55277791 is an apocalyptic number.

55277791 is a deficient number, since it is larger than the sum of its proper divisors (1).

55277791 is an equidigital number, since it uses as much as digits as its factorization.

55277791 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 55277791 is about 7434.9035635978. The cubic root of 55277791 is about 380.9344293255.

The spelling of 55277791 in words is "fifty-five million, two hundred seventy-seven thousand, seven hundred ninety-one".