55471681 has 4 divisors (see below), whose sum is σ = 56043652. Its totient is φ = 54899712.

The previous prime is 55471649. The next prime is 55471687. The reversal of 55471681 is 18617455.

55471681 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.

It can be written as a sum of positive squares in 2 ways, for example, as 29257281 + 26214400 = 5409^2 + 5120^2 .

It is a cyclic number.

It is not a de Polignac number, because 55471681 - 2⁵ = 55471649 is a prime.

It is a super-2 number, since 2×55471681² = 6154214785931522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55471681.

It is not an unprimeable number, because it can be changed into a prime (55471687) 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, 285840 + ... + 286033.

It is an arithmetic number, because the mean of its divisors is an integer number (14010913).

Almost surely, 2^55471681 is an apocalyptic number.

It is an amenable number.

55471681 is a deficient number, since it is larger than the sum of its proper divisors (571971).

55471681 is an equidigital number, since it uses as much as digits as its factorization.

55471681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571970.

The product of its digits is 33600, while the sum is 37.

The square root of 55471681 is about 7447.9313235287. The cubic root of 55471681 is about 381.3792926707.

The spelling of 55471681 in words is "fifty-five million, four hundred seventy-one thousand, six hundred eighty-one".