55605281 has 4 divisors (see below), whose sum is σ = 55648512. Its totient is φ = 55562052.

The previous prime is 55605241. The next prime is 55605293. The reversal of 55605281 is 18250655.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55605281 - 2¹⁰ = 55604257 is a prime.

It is a super-2 number, since 2×55605281² = 6183894550177922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55605211) 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, 19625 + ... + 22278.

It is an arithmetic number, because the mean of its divisors is an integer number (13912128).

Almost surely, 2^55605281 is an apocalyptic number.

It is an amenable number.

55605281 is a deficient number, since it is larger than the sum of its proper divisors (43231).

55605281 is a wasteful number, since it uses less digits than its factorization.

55605281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43230.

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 55605281 is about 7456.8948631451. The cubic root of 55605281 is about 381.6852230850.

The spelling of 55605281 in words is "fifty-five million, six hundred five thousand, two hundred eighty-one".