55155571 has 4 divisors (see below), whose sum is σ = 55365552. Its totient is φ = 54945592.

The previous prime is 55155559. The next prime is 55155629. The reversal of 55155571 is 17555155.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55155571 - 2²¹ = 53058419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55155511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104596 + ... + 105121.

It is an arithmetic number, because the mean of its divisors is an integer number (13841388).

Almost surely, 2^55155571 is an apocalyptic number.

55155571 is a deficient number, since it is larger than the sum of its proper divisors (209981).

55155571 is a wasteful number, since it uses less digits than its factorization.

55155571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209980.

The product of its digits is 21875, while the sum is 34.

The square root of 55155571 is about 7426.6796753327. The cubic root of 55155571 is about 380.6534716349.

The spelling of 55155571 in words is "fifty-five million, one hundred fifty-five thousand, five hundred seventy-one".