3861431531 has 4 divisors (see below), whose sum is σ = 3863347992. Its totient is φ = 3859515072.

The previous prime is 3861431507. The next prime is 3861431549. The reversal of 3861431531 is 1351341683.

3861431531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3861431531 - 2¹⁴ = 3861415147 is a prime.

It is a super-2 number, since 2×3861431531² = 29821306937202007922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3861431491 and 3861431500.

It is not an unprimeable number, because it can be changed into a prime (3861431551) 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, 955205 + ... + 959238.

It is an arithmetic number, because the mean of its divisors is an integer number (965836998).

Almost surely, 2^3861431531 is an apocalyptic number.

3861431531 is a deficient number, since it is larger than the sum of its proper divisors (1916461).

3861431531 is a wasteful number, since it uses less digits than its factorization.

3861431531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1916460.

The product of its digits is 25920, while the sum is 35.

The square root of 3861431531 is about 62140.4178534390. The cubic root of 3861431531 is about 1568.8549037196.

The spelling of 3861431531 in words is "three billion, eight hundred sixty-one million, four hundred thirty-one thousand, five hundred thirty-one".