55211281 has 2 divisors, whose sum is σ = 55211282. Its totient is φ = 55211280.

The previous prime is 55211263. The next prime is 55211309. The reversal of 55211281 is 18211255.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55130625 + 80656 = 7425^2 + 284^2 .

It is a cyclic number.

It is not a de Polignac number, because 55211281 - 2⁵ = 55211249 is a prime.

It is a super-2 number, since 2×55211281² = 6096571099321922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55241281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27605640 + 27605641.

It is an arithmetic number, because the mean of its divisors is an integer number (27605641).

Almost surely, 2^55211281 is an apocalyptic number.

It is an amenable number.

55211281 is a deficient number, since it is larger than the sum of its proper divisors (1).

55211281 is an equidigital number, since it uses as much as digits as its factorization.

55211281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 800, while the sum is 25.

The square root of 55211281 is about 7430.4293953984. The cubic root of 55211281 is about 380.7815884551.

The spelling of 55211281 in words is "fifty-five million, two hundred eleven thousand, two hundred eighty-one".