55691437 has 4 divisors (see below), whose sum is σ = 55711260. Its totient is φ = 55671616.

The previous prime is 55691369. The next prime is 55691453. The reversal of 55691437 is 73419655.

55691437 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 54597321 + 1094116 = 7389^2 + 1046^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55691437 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 55691437.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55691737) 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, 4828 + ... + 11605.

It is an arithmetic number, because the mean of its divisors is an integer number (13927815).

Almost surely, 2^55691437 is an apocalyptic number.

It is an amenable number.

55691437 is a deficient number, since it is larger than the sum of its proper divisors (19823).

55691437 is a wasteful number, since it uses less digits than its factorization.

55691437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19822.

The product of its digits is 113400, while the sum is 40.

The square root of 55691437 is about 7462.6695625627. The cubic root of 55691437 is about 381.8822517492.

The spelling of 55691437 in words is "fifty-five million, six hundred ninety-one thousand, four hundred thirty-seven".