55491516 has 18 divisors (see below), whose sum is σ = 140270312. Its totient is φ = 18497160.

The previous prime is 55491497. The next prime is 55491539. The reversal of 55491516 is 61519455.

55491516 is a `hidden beast` number, since 5 + 54 + 91 + 516 = 666.

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: 1541431 = 55491516 / (5 + 5 + 4 + 9 + 1 + 5 + 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 (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 770680 + ... + 770751.

Almost surely, 2^55491516 is an apocalyptic number.

It is an amenable number.

55491516 is an abundant number, since it is smaller than the sum of its proper divisors (84778796).

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

55491516 is a wasteful number, since it uses less digits than its factorization.

55491516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1541441 (or 1541436 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The square root of 55491516 is about 7449.2627823161. The cubic root of 55491516 is about 381.4247438311.

It can be divided in two parts, 554915 and 16, that added together give a triangular number (554931 = T₁₀₅₃).

The spelling of 55491516 in words is "fifty-five million, four hundred ninety-one thousand, five hundred sixteen".