55478869 has 2 divisors, whose sum is σ = 55478870. Its totient is φ = 55478868.

The previous prime is 55478861. The next prime is 55478887. The reversal of 55478869 is 96887455.

55478869 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., 50594769 + 4884100 = 7113^2 + 2210^2 .

It is a cyclic number.

It is not a de Polignac number, because 55478869 - 2³ = 55478861 is a prime.

It is a super-2 number, since 2×55478869² = 6155809811038322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55478861) 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, 27739434 + 27739435.

It is an arithmetic number, because the mean of its divisors is an integer number (27739435).

Almost surely, 2^55478869 is an apocalyptic number.

It is an amenable number.

55478869 is a deficient number, since it is larger than the sum of its proper divisors (1).

55478869 is an equidigital number, since it uses as much as digits as its factorization.

55478869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2419200, while the sum is 52.

The square root of 55478869 is about 7448.4138579969. The cubic root of 55478869 is about 381.3957649553.

The spelling of 55478869 in words is "fifty-five million, four hundred seventy-eight thousand, eight hundred sixty-nine".