3861518506231 has 4 divisors (see below), whose sum is σ = 3863562721200. Its totient is φ = 3859474291264.

The previous prime is 3861518506187. The next prime is 3861518506249. The reversal of 3861518506231 is 1326058151683.

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 3861518506231 - 2²³ = 3861510117623 is a prime.

It is a super-2 number, since 2×3861518506231² (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 (3861518506271) 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, 1022104651 + ... + 1022108428.

It is an arithmetic number, because the mean of its divisors is an integer number (965890680300).

Almost surely, 2^{3861518506231} is an apocalyptic number.

3861518506231 is a deficient number, since it is larger than the sum of its proper divisors (2044214969).

3861518506231 is a wasteful number, since it uses less digits than its factorization.

3861518506231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2044214968.

The product of its (nonzero) digits is 1036800, while the sum is 49.

The spelling of 3861518506231 in words is "three trillion, eight hundred sixty-one billion, five hundred eighteen million, five hundred six thousand, two hundred thirty-one".