55381569 has 8 divisors (see below), whose sum is σ = 74062560. Its totient is φ = 36810816.

The previous prime is 55381567. The next prime is 55381591. The reversal of 55381569 is 96518355.

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

It is not a de Polignac number, because 55381569 - 2¹ = 55381567 is a prime.

It is a super-2 number, since 2×55381569² = 6134236369803522, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 55381569.

It is not an unprimeable number, because it can be changed into a prime (55381567) 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 7 ways as a sum of consecutive naturals, for example, 26379 + ... + 28400.

It is an arithmetic number, because the mean of its divisors is an integer number (9257820).

Almost surely, 2^55381569 is an apocalyptic number.

It is an amenable number.

55381569 is a deficient number, since it is larger than the sum of its proper divisors (18680991).

55381569 is a wasteful number, since it uses less digits than its factorization.

55381569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55119.

The product of its digits is 162000, while the sum is 42.

The square root of 55381569 is about 7441.8793997216. The cubic root of 55381569 is about 381.1726678590.

The spelling of 55381569 in words is "fifty-five million, three hundred eighty-one thousand, five hundred sixty-nine".