5209449181 has 2 divisors, whose sum is σ = 5209449182. Its totient is φ = 5209449180.

The previous prime is 5209449169. The next prime is 5209449209. The reversal of 5209449181 is 1819449025.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5099388100 + 110061081 = 71410^2 + 10491^2 .

It is a cyclic number.

It is not a de Polignac number, because 5209449181 - 2⁵ = 5209449149 is a prime.

It is a super-2 number, since 2×5209449181² = 54276721538843141522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5209443181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2604724590 + 2604724591.

It is an arithmetic number, because the mean of its divisors is an integer number (2604724591).

Almost surely, 2^5209449181 is an apocalyptic number.

It is an amenable number.

5209449181 is a deficient number, since it is larger than the sum of its proper divisors (1).

5209449181 is an equidigital number, since it uses as much as digits as its factorization.

5209449181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 5209449181 is about 72176.5140540883. The cubic root of 5209449181 is about 1733.5269667269.

The spelling of 5209449181 in words is "five billion, two hundred nine million, four hundred forty-nine thousand, one hundred eighty-one".