55520109 has 24 divisors (see below), whose sum is σ = 86486400. Its totient is φ = 34205760.

The previous prime is 55520107. The next prime is 55520149. The reversal of 55520109 is 90102555.

55520109 is a `hidden beast` number, since 5 + 552 + 0 + 109 = 666.

It is not a de Polignac number, because 55520109 - 2¹ = 55520107 is a prime.

It is a super-3 number, since 3×55520109³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55520107) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3052 + ... + 10970.

It is an arithmetic number, because the mean of its divisors is an integer number (3603600).

Almost surely, 2^55520109 is an apocalyptic number.

It is an amenable number.

55520109 is a deficient number, since it is larger than the sum of its proper divisors (30966291).

55520109 is a wasteful number, since it uses less digits than its factorization.

55520109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7985 (or 7982 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 27.

The square root of 55520109 is about 7451.1817183585. The cubic root of 55520109 is about 381.4902445649.

The spelling of 55520109 in words is "fifty-five million, five hundred twenty thousand, one hundred nine".