55521409 has 8 divisors (see below), whose sum is σ = 56041920. Its totient is φ = 55003536.

The previous prime is 55521377. The next prime is 55521443. The reversal of 55521409 is 90412555.

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 55521409 - 2⁵ = 55521377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55521469) 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, 83922 + ... + 84580.

It is an arithmetic number, because the mean of its divisors is an integer number (7005240).

Almost surely, 2^55521409 is an apocalyptic number.

It is an amenable number.

55521409 is a deficient number, since it is larger than the sum of its proper divisors (520511).

55521409 is a wasteful number, since it uses less digits than its factorization.

55521409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1319.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 55521409 is about 7451.2689523329. The cubic root of 55521409 is about 381.4932220653.

The spelling of 55521409 in words is "fifty-five million, five hundred twenty-one thousand, four hundred nine".