55371909 has 16 divisors (see below), whose sum is σ = 79185600. Its totient is φ = 34310016.

The previous prime is 55371889. The next prime is 55371923. The reversal of 55371909 is 90917355.

It is not a de Polignac number, because 55371909 - 2¹³ = 55363717 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55371929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6144 + ... + 12185.

It is an arithmetic number, because the mean of its divisors is an integer number (4949100).

Almost surely, 2^55371909 is an apocalyptic number.

It is an amenable number.

55371909 is a deficient number, since it is larger than the sum of its proper divisors (23813691).

55371909 is a wasteful number, since it uses less digits than its factorization.

55371909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18404.

The product of its (nonzero) digits is 42525, while the sum is 39.

The square root of 55371909 is about 7441.2303418185. The cubic root of 55371909 is about 381.1505043959.

It can be divided in two parts, 55371 and 909, that added together give a triangular number (56280 = T₃₃₅).

The spelling of 55371909 in words is "fifty-five million, three hundred seventy-one thousand, nine hundred nine".