55122281 has 4 divisors (see below), whose sum is σ = 55628100. Its totient is φ = 54616464.

The previous prime is 55122241. The next prime is 55122289. The reversal of 55122281 is 18222155.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22174681 + 32947600 = 4709^2 + 5740^2 .

It is a cyclic number.

It is not a de Polignac number, because 55122281 - 2⁶ = 55122217 is a prime.

It is a super-2 number, since 2×55122281² = 6076931725285922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55122281.

It is not an unprimeable number, because it can be changed into a prime (55122289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252746 + ... + 252963.

It is an arithmetic number, because the mean of its divisors is an integer number (13907025).

Almost surely, 2^55122281 is an apocalyptic number.

It is an amenable number.

55122281 is a deficient number, since it is larger than the sum of its proper divisors (505819).

55122281 is a wasteful number, since it uses less digits than its factorization.

55122281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505818.

The product of its digits is 1600, while the sum is 26.

The square root of 55122281 is about 7424.4380932162. The cubic root of 55122281 is about 380.5768731207.

The spelling of 55122281 in words is "fifty-five million, one hundred twenty-two thousand, two hundred eighty-one".