55691316 has 18 divisors (see below), whose sum is σ = 140775362. Its totient is φ = 18563760.

The previous prime is 55691297. The next prime is 55691333. The reversal of 55691316 is 61319655.

55691316 is a `hidden beast` number, since 556 + 91 + 3 + 16 = 666.

It can be written as a sum of positive squares in only one way, i.e., 53144100 + 2547216 = 7290^2 + 1596^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1546981 = 55691316 / (5 + 5 + 6 + 9 + 1 + 3 + 1 + 6).

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 773455 + ... + 773526.

Almost surely, 2^55691316 is an apocalyptic number.

It is an amenable number.

55691316 is an abundant number, since it is smaller than the sum of its proper divisors (85084046).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55691316 is a wasteful number, since it uses less digits than its factorization.

55691316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1546991 (or 1546986 counting only the distinct ones).

The product of its digits is 24300, while the sum is 36.

The square root of 55691316 is about 7462.6614555398. The cubic root of 55691316 is about 381.8819751789.

The spelling of 55691316 in words is "fifty-five million, six hundred ninety-one thousand, three hundred sixteen".