55549561 has 8 divisors (see below), whose sum is σ = 56777600. Its totient is φ = 54334800.

The previous prime is 55549537. The next prime is 55549573. The reversal of 55549561 is 16594555.

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

It is a cyclic number.

It is not a de Polignac number, because 55549561 - 2⁷ = 55549433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55549511) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5386 + ... + 11836.

It is an arithmetic number, because the mean of its divisors is an integer number (7097200).

Almost surely, 2^55549561 is an apocalyptic number.

It is an amenable number.

55549561 is a deficient number, since it is larger than the sum of its proper divisors (1228039).

55549561 is a wasteful number, since it uses less digits than its factorization.

55549561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6639.

The product of its digits is 135000, while the sum is 40.

The square root of 55549561 is about 7453.1577871396. The cubic root of 55549561 is about 381.5576895846.

The spelling of 55549561 in words is "fifty-five million, five hundred forty-nine thousand, five hundred sixty-one".