4438685861 has 2 divisors, whose sum is σ = 4438685862. Its totient is φ = 4438685860.

The previous prime is 4438685827. The next prime is 4438685887. The reversal of 4438685861 is 1685868344.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4255083361 + 183602500 = 65231^2 + 13550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4438685861 is a prime.

It is a super-2 number, since 2×4438685861² = 39403864345282622642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4438685821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2219342930 + 2219342931.

It is an arithmetic number, because the mean of its divisors is an integer number (2219342931).

Almost surely, 2^4438685861 is an apocalyptic number.

It is an amenable number.

4438685861 is a deficient number, since it is larger than the sum of its proper divisors (1).

4438685861 is an equidigital number, since it uses as much as digits as its factorization.

4438685861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4423680, while the sum is 53.

The square root of 4438685861 is about 66623.4632918464. The cubic root of 4438685861 is about 1643.4309815796.

The spelling of 4438685861 in words is "four billion, four hundred thirty-eight million, six hundred eighty-five thousand, eight hundred sixty-one".