3861865432831 has 16 divisors (see below), whose sum is σ = 4423664200000. Its totient is φ = 3302600491008.

The previous prime is 3861865432811. The next prime is 3861865432837. The reversal of 3861865432831 is 1382345681683.

It is a happy number.

It is not a de Polignac number, because 3861865432831 - 2²⁷ = 3861731215103 is a prime.

It is a super-2 number, since 2×3861865432831² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3861865432837) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5555875 + ... + 6212203.

It is an arithmetic number, because the mean of its divisors is an integer number (276479012500).

Almost surely, 2^{3861865432831} is an apocalyptic number.

3861865432831 is a deficient number, since it is larger than the sum of its proper divisors (561798767169).

3861865432831 is a wasteful number, since it uses less digits than its factorization.

3861865432831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658258.

The product of its digits is 19906560, while the sum is 58.

The spelling of 3861865432831 in words is "three trillion, eight hundred sixty-one billion, eight hundred sixty-five million, four hundred thirty-two thousand, eight hundred thirty-one".