55502281 has 2 divisors, whose sum is σ = 55502282. Its totient is φ = 55502280.

The previous prime is 55502221. The next prime is 55502309. The reversal of 55502281 is 18220555.

It is an a-pointer prime, because the next prime (55502309) can be obtained adding 55502281 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48163600 + 7338681 = 6940^2 + 2709^2 .

It is a cyclic number.

It is not a de Polignac number, because 55502281 - 2⁹ = 55501769 is a prime.

It is a super-2 number, since 2×55502281² = 6161006392405922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55502221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27751140 + 27751141.

It is an arithmetic number, because the mean of its divisors is an integer number (27751141).

Almost surely, 2^55502281 is an apocalyptic number.

It is an amenable number.

55502281 is a deficient number, since it is larger than the sum of its proper divisors (1).

55502281 is an equidigital number, since it uses as much as digits as its factorization.

55502281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4000, while the sum is 28.

The square root of 55502281 is about 7449.9853019989. The cubic root of 55502281 is about 381.4494068918.

The spelling of 55502281 in words is "fifty-five million, five hundred two thousand, two hundred eighty-one".