4449218261 has 4 divisors (see below), whose sum is σ = 4524628800. Its totient is φ = 4373807724.

The previous prime is 4449218243. The next prime is 4449218273. The reversal of 4449218261 is 1628129444.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4449218261 - 2¹⁴ = 4449201877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4449218561) 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, 37705181 + ... + 37705298.

It is an arithmetic number, because the mean of its divisors is an integer number (1131157200).

Almost surely, 2^4449218261 is an apocalyptic number.

It is an amenable number.

4449218261 is a deficient number, since it is larger than the sum of its proper divisors (75410539).

4449218261 is an equidigital number, since it uses as much as digits as its factorization.

4449218261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75410538.

The product of its digits is 110592, while the sum is 41.

The square root of 4449218261 is about 66702.4606817470. The cubic root of 4449218261 is about 1644.7298344518.

The spelling of 4449218261 in words is "four billion, four hundred forty-nine million, two hundred eighteen thousand, two hundred sixty-one".