55587381 has 16 divisors (see below), whose sum is σ = 75643200. Its totient is φ = 36299648.

The previous prime is 55587359. The next prime is 55587419. The reversal of 55587381 is 18378555.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 55587381 - 2⁷ = 55587253 is a prime.

It is a super-2 number, since 2×55587381² = 6179913852878322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55587881) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 89785 + ... + 90401.

It is an arithmetic number, because the mean of its divisors is an integer number (4727700).

Almost surely, 2^55587381 is an apocalyptic number.

It is an amenable number.

55587381 is a deficient number, since it is larger than the sum of its proper divisors (20055819).

55587381 is a wasteful number, since it uses less digits than its factorization.

55587381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1188.

The product of its digits is 168000, while the sum is 42.

The square root of 55587381 is about 7455.6945350517. The cubic root of 55587381 is about 381.6442623547.

The spelling of 55587381 in words is "fifty-five million, five hundred eighty-seven thousand, three hundred eighty-one".