55508681 has 2 divisors, whose sum is σ = 55508682. Its totient is φ = 55508680.

The previous prime is 55508669. The next prime is 55508737. The reversal of 55508681 is 18680555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55428025 + 80656 = 7445^2 + 284^2 .

It is a cyclic number.

It is not a de Polignac number, because 55508681 - 2⁶ = 55508617 is a prime.

It is a super-2 number, since 2×55508681² = 6162427332719522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (55508641) 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 as a sum of consecutive naturals, namely, 27754340 + 27754341.

It is an arithmetic number, because the mean of its divisors is an integer number (27754341).

Almost surely, 2^55508681 is an apocalyptic number.

It is an amenable number.

55508681 is a deficient number, since it is larger than the sum of its proper divisors (1).

55508681 is an equidigital number, since it uses as much as digits as its factorization.

55508681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48000, while the sum is 38.

The square root of 55508681 is about 7450.4148206660. The cubic root of 55508681 is about 381.4640680452.

The spelling of 55508681 in words is "fifty-five million, five hundred eight thousand, six hundred eighty-one".