55871511 has 16 divisors (see below), whose sum is σ = 75368448. Its totient is φ = 36814400.

The previous prime is 55871509. The next prime is 55871549. The reversal of 55871511 is 11517855.

It is a cyclic number.

It is not a de Polignac number, because 55871511 - 2¹ = 55871509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55871551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160840 + ... + 161186.

It is an arithmetic number, because the mean of its divisors is an integer number (4710528).

Almost surely, 2^55871511 is an apocalyptic number.

55871511 is a deficient number, since it is larger than the sum of its proper divisors (19496937).

55871511 is a wasteful number, since it uses less digits than its factorization.

55871511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822.

The product of its digits is 7000, while the sum is 33.

The square root of 55871511 is about 7474.7248109880. The cubic root of 55871511 is about 382.2934046031.

The spelling of 55871511 in words is "fifty-five million, eight hundred seventy-one thousand, five hundred eleven".