55681361 has 2 divisors, whose sum is σ = 55681362. Its totient is φ = 55681360.

The previous prime is 55681357. The next prime is 55681369. The reversal of 55681361 is 16318655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42315025 + 13366336 = 6505^2 + 3656^2 .

It is a cyclic number.

It is not a de Polignac number, because 55681361 - 2² = 55681357 is a prime.

It is not a weakly prime, because it can be changed into another prime (55681369) 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 as a sum of consecutive naturals, namely, 27840680 + 27840681.

It is an arithmetic number, because the mean of its divisors is an integer number (27840681).

Almost surely, 2^55681361 is an apocalyptic number.

It is an amenable number.

55681361 is a deficient number, since it is larger than the sum of its proper divisors (1).

55681361 is an equidigital number, since it uses as much as digits as its factorization.

55681361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 35.

The square root of 55681361 is about 7461.9944384863. The cubic root of 55681361 is about 381.8592196168.

The spelling of 55681361 in words is "fifty-five million, six hundred eighty-one thousand, three hundred sixty-one".