55399817 has 4 divisors (see below), whose sum is σ = 60436176. Its totient is φ = 50363460.

The previous prime is 55399807. The next prime is 55399819. The reversal of 55399817 is 71899355.

55399817 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55399817 - 2¹² = 55395721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55399819) 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 in 3 ways as a sum of consecutive naturals, for example, 2518163 + ... + 2518184.

It is an arithmetic number, because the mean of its divisors is an integer number (15109044).

Almost surely, 2^55399817 is an apocalyptic number.

It is an amenable number.

55399817 is a deficient number, since it is larger than the sum of its proper divisors (5036359).

55399817 is a wasteful number, since it uses less digits than its factorization.

55399817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5036358.

The product of its digits is 340200, while the sum is 47.

The square root of 55399817 is about 7443.1053331254. The cubic root of 55399817 is about 381.2145282056.

The spelling of 55399817 in words is "fifty-five million, three hundred ninety-nine thousand, eight hundred seventeen".