3831778081 has 4 divisors (see below), whose sum is σ = 3998377152. Its totient is φ = 3665179012.

The previous prime is 3831778079. The next prime is 3831778109. The reversal of 3831778081 is 1808771383.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1808771383 = 29 ⋅62371427.

It is a cyclic number.

It is not a de Polignac number, because 3831778081 - 2¹ = 3831778079 is a prime.

It is a super-2 number, since 2×3831778081² = 29365046524064085122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3831778021) 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 in 3 ways as a sum of consecutive naturals, for example, 83299501 + ... + 83299546.

It is an arithmetic number, because the mean of its divisors is an integer number (999594288).

Almost surely, 2^3831778081 is an apocalyptic number.

It is an amenable number.

3831778081 is a deficient number, since it is larger than the sum of its proper divisors (166599071).

3831778081 is a wasteful number, since it uses less digits than its factorization.

3831778081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166599070.

The product of its (nonzero) digits is 225792, while the sum is 46.

The square root of 3831778081 is about 61901.3576668557. The cubic root of 3831778081 is about 1564.8286285283.

The spelling of 3831778081 in words is "three billion, eight hundred thirty-one million, seven hundred seventy-eight thousand, eighty-one".