55388917 has 4 divisors (see below), whose sum is σ = 55631020. Its totient is φ = 55146816.

The previous prime is 55388911. The next prime is 55388939. The reversal of 55388917 is 71988355.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27941796 + 27447121 = 5286^2 + 5239^2 .

It is a cyclic number.

It is not a de Polignac number, because 55388917 - 2¹¹ = 55386869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55388911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120708 + ... + 121165.

It is an arithmetic number, because the mean of its divisors is an integer number (13907755).

Almost surely, 2^55388917 is an apocalyptic number.

It is an amenable number.

55388917 is a deficient number, since it is larger than the sum of its proper divisors (242103).

55388917 is a wasteful number, since it uses less digits than its factorization.

55388917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242102.

The product of its digits is 302400, while the sum is 46.

The square root of 55388917 is about 7442.3730758408. The cubic root of 55388917 is about 381.1895250490.

The spelling of 55388917 in words is "fifty-five million, three hundred eighty-eight thousand, nine hundred seventeen".