55511691 has 4 divisors (see below), whose sum is σ = 74015592. Its totient is φ = 37007792.

The previous prime is 55511689. The next prime is 55511717. The reversal of 55511691 is 19611555.

55511691 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 is a cyclic number.

It is not a de Polignac number, because 55511691 - 2¹ = 55511689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55511611) 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, 9251946 + ... + 9251951.

It is an arithmetic number, because the mean of its divisors is an integer number (18503898).

Almost surely, 2^55511691 is an apocalyptic number.

55511691 is a deficient number, since it is larger than the sum of its proper divisors (18503901).

55511691 is a wasteful number, since it uses less digits than its factorization.

55511691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18503900.

The product of its digits is 6750, while the sum is 33.

The square root of 55511691 is about 7450.6168201029. The cubic root of 55511691 is about 381.4709629793.

It can be divided in two parts, 555 and 11691, that added together give a triangular number (12246 = T₁₅₆).

The spelling of 55511691 in words is "fifty-five million, five hundred eleven thousand, six hundred ninety-one".