3826581861 has 4 divisors (see below), whose sum is σ = 5102109152. Its totient is φ = 2551054572.

The previous prime is 3826581851. The next prime is 3826581907. The reversal of 3826581861 is 1681856283.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1681856283 = 3 ⋅560618761.

It is not a de Polignac number, because 3826581861 - 2⁶ = 3826581797 is a prime.

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 3826581861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3826581851) 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, 637763641 + ... + 637763646.

It is an arithmetic number, because the mean of its divisors is an integer number (1275527288).

Almost surely, 2^3826581861 is an apocalyptic number.

It is an amenable number.

3826581861 is a deficient number, since it is larger than the sum of its proper divisors (1275527291).

3826581861 is a wasteful number, since it uses less digits than its factorization.

3826581861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1275527290.

The product of its digits is 552960, while the sum is 48.

The square root of 3826581861 is about 61859.3716505430. The cubic root of 3826581861 is about 1564.1209612306.

The spelling of 3826581861 in words is "three billion, eight hundred twenty-six million, five hundred eighty-one thousand, eight hundred sixty-one".