55775281 has 2 divisors, whose sum is σ = 55775282. Its totient is φ = 55775280.

The previous prime is 55775273. The next prime is 55775297. The reversal of 55775281 is 18257755.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29160000 + 26615281 = 5400^2 + 5159^2 .

It is a cyclic number.

It is not a de Polignac number, because 55775281 - 2³ = 55775273 is a prime.

It is a super-2 number, since 2×55775281² = 6221763941257922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55775261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27887640 + 27887641.

It is an arithmetic number, because the mean of its divisors is an integer number (27887641).

Almost surely, 2^55775281 is an apocalyptic number.

It is an amenable number.

55775281 is a deficient number, since it is larger than the sum of its proper divisors (1).

55775281 is an equidigital number, since it uses as much as digits as its factorization.

55775281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 98000, while the sum is 40.

The square root of 55775281 is about 7468.2850106300. The cubic root of 55775281 is about 382.0737981376.

The spelling of 55775281 in words is "fifty-five million, seven hundred seventy-five thousand, two hundred eighty-one".