3865731361 has 4 divisors (see below), whose sum is σ = 3923428912. Its totient is φ = 3808033812.

The previous prime is 3865731323. The next prime is 3865731379. The reversal of 3865731361 is 1631375683.

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: 1631375683 = 7 ⋅233053669.

It is a cyclic number.

It is not a de Polignac number, because 3865731361 - 2¹⁵ = 3865698593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3865731061) 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, 28848675 + ... + 28848808.

It is an arithmetic number, because the mean of its divisors is an integer number (980857228).

Almost surely, 2^3865731361 is an apocalyptic number.

It is an amenable number.

3865731361 is a deficient number, since it is larger than the sum of its proper divisors (57697551).

3865731361 is an equidigital number, since it uses as much as digits as its factorization.

3865731361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57697550.

The product of its digits is 272160, while the sum is 43.

The square root of 3865731361 is about 62175.0059187774. The cubic root of 3865731361 is about 1569.4370114156.

The spelling of 3865731361 in words is "three billion, eight hundred sixty-five million, seven hundred thirty-one thousand, three hundred sixty-one".