55521347 has 4 divisors (see below), whose sum is σ = 63452976. Its totient is φ = 47589720.

The previous prime is 55521343. The next prime is 55521353. The reversal of 55521347 is 74312555.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74312555 = 5 ⋅14862511.

It is a cyclic number.

It is not a de Polignac number, because 55521347 - 2² = 55521343 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55521343) 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, 3965804 + ... + 3965817.

It is an arithmetic number, because the mean of its divisors is an integer number (15863244).

Almost surely, 2^55521347 is an apocalyptic number.

55521347 is a deficient number, since it is larger than the sum of its proper divisors (7931629).

55521347 is an equidigital number, since it uses as much as digits as its factorization.

55521347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7931628.

The product of its digits is 21000, while the sum is 32.

The square root of 55521347 is about 7451.2647919665. The cubic root of 55521347 is about 381.4930800625.

The spelling of 55521347 in words is "fifty-five million, five hundred twenty-one thousand, three hundred forty-seven".