55199281 has 2 divisors, whose sum is σ = 55199282. Its totient is φ = 55199280.

The previous prime is 55199269. The next prime is 55199297. The reversal of 55199281 is 18299155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42837025 + 12362256 = 6545^2 + 3516^2 .

It is a cyclic number.

It is not a de Polignac number, because 55199281 - 2⁹ = 55198769 is a prime.

It is a super-2 number, since 2×55199281² = 6093921245833922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55199381) 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, 27599640 + 27599641.

It is an arithmetic number, because the mean of its divisors is an integer number (27599641).

Almost surely, 2^55199281 is an apocalyptic number.

It is an amenable number.

55199281 is a deficient number, since it is larger than the sum of its proper divisors (1).

55199281 is an equidigital number, since it uses as much as digits as its factorization.

55199281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 40.

The square root of 55199281 is about 7429.6218611717. The cubic root of 55199281 is about 380.7539992254.

The spelling of 55199281 in words is "fifty-five million, one hundred ninety-nine thousand, two hundred eighty-one".