55987491 has 8 divisors (see below), whose sum is σ = 85314304. Its totient is φ = 31992840.

The previous prime is 55987483. The next prime is 55987493. The reversal of 55987491 is 19478955.

55987491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55987491 - 2³ = 55987483 is a prime.

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 55987491.

It is not an unprimeable number, because it can be changed into a prime (55987493) 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 7 ways as a sum of consecutive naturals, for example, 1333015 + ... + 1333056.

It is an arithmetic number, because the mean of its divisors is an integer number (10664288).

Almost surely, 2^55987491 is an apocalyptic number.

55987491 is a deficient number, since it is larger than the sum of its proper divisors (29326813).

55987491 is a wasteful number, since it uses less digits than its factorization.

55987491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2666081.

The product of its digits is 453600, while the sum is 48.

The square root of 55987491 is about 7482.4789341501. The cubic root of 55987491 is about 382.5577476996.

The spelling of 55987491 in words is "fifty-five million, nine hundred eighty-seven thousand, four hundred ninety-one".