55621547 has 4 divisors (see below), whose sum is σ = 56383560. Its totient is φ = 54859536.

The previous prime is 55621541. The next prime is 55621549. The reversal of 55621547 is 74512655.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55621547 - 2²⁰ = 54572971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55621541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 380897 + ... + 381042.

It is an arithmetic number, because the mean of its divisors is an integer number (14095890).

Almost surely, 2^55621547 is an apocalyptic number.

55621547 is a deficient number, since it is larger than the sum of its proper divisors (762013).

55621547 is an equidigital number, since it uses as much as digits as its factorization.

55621547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 762012.

The product of its digits is 42000, while the sum is 35.

The square root of 55621547 is about 7457.9854518496. The cubic root of 55621547 is about 381.7224370956.

The spelling of 55621547 in words is "fifty-five million, six hundred twenty-one thousand, five hundred forty-seven".