55109571 has 12 divisors (see below), whose sum is σ = 80767176. Its totient is φ = 33399520.

The previous prime is 55109569. The next prime is 55109573. The reversal of 55109571 is 17590155.

It is an interprime number because it is at equal distance from previous prime (55109569) and next prime (55109573).

It is not a de Polignac number, because 55109571 - 2¹ = 55109569 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (55109573) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 75546 + ... + 76271.

It is an arithmetic number, because the mean of its divisors is an integer number (6730598).

Almost surely, 2^55109571 is an apocalyptic number.

55109571 is a deficient number, since it is larger than the sum of its proper divisors (25657605).

55109571 is a wasteful number, since it uses less digits than its factorization.

55109571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151842 (or 151831 counting only the distinct ones).

The product of its (nonzero) digits is 7875, while the sum is 33.

The square root of 55109571 is about 7423.5820868365. The cubic root of 55109571 is about 380.5476199536.

The spelling of 55109571 in words is "fifty-five million, one hundred nine thousand, five hundred seventy-one".