55909901 has 4 divisors (see below), whose sum is σ = 55927872. Its totient is φ = 55891932.

The previous prime is 55909877. The next prime is 55909921. The reversal of 55909901 is 10990955.

55909901 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, and also an emirpimes, since its reverse is a distinct semiprime: 10990955 = 5 ⋅2198191.

It is a cyclic number.

It is not a de Polignac number, because 55909901 - 2¹⁴ = 55893517 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 (55909921) 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, 2981 + ... + 10986.

It is an arithmetic number, because the mean of its divisors is an integer number (13981968).

Almost surely, 2^55909901 is an apocalyptic number.

It is an amenable number.

55909901 is a deficient number, since it is larger than the sum of its proper divisors (17971).

55909901 is a wasteful number, since it uses less digits than its factorization.

55909901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17970.

The product of its (nonzero) digits is 18225, while the sum is 38.

The square root of 55909901 is about 7477.2923575316. The cubic root of 55909901 is about 382.3809440509.

The spelling of 55909901 in words is "fifty-five million, nine hundred nine thousand, nine hundred one".