55220281 has 2 divisors, whose sum is σ = 55220282. Its totient is φ = 55220280.

The previous prime is 55220273. The next prime is 55220293. The reversal of 55220281 is 18202255.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46717225 + 8503056 = 6835^2 + 2916^2 .

It is a cyclic number.

It is not a de Polignac number, because 55220281 - 2³ = 55220273 is a prime.

It is a super-2 number, since 2×55220281² = 6098558867437922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55229281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27610140 + 27610141.

It is an arithmetic number, because the mean of its divisors is an integer number (27610141).

Almost surely, 2^55220281 is an apocalyptic number.

It is an amenable number.

55220281 is a deficient number, since it is larger than the sum of its proper divisors (1).

55220281 is an equidigital number, since it uses as much as digits as its factorization.

55220281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 55220281 is about 7431.0349884791. The cubic root of 55220281 is about 380.8022777541.

The spelling of 55220281 in words is "fifty-five million, two hundred twenty thousand, two hundred eighty-one".