3935431861 has 4 divisors (see below), whose sum is σ = 3938500512. Its totient is φ = 3932363212.

The previous prime is 3935431849. The next prime is 3935431873. The reversal of 3935431861 is 1681345393.

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.

It is an interprime number because it is at equal distance from previous prime (3935431849) and next prime (3935431873).

It is a cyclic number.

It is not a de Polignac number, because 3935431861 - 2⁹ = 3935431349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3935431831) 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, 1532401 + ... + 1534966.

It is an arithmetic number, because the mean of its divisors is an integer number (984625128).

Almost surely, 2^3935431861 is an apocalyptic number.

It is an amenable number.

3935431861 is a deficient number, since it is larger than the sum of its proper divisors (3068651).

3935431861 is a wasteful number, since it uses less digits than its factorization.

3935431861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3068650.

The product of its digits is 233280, while the sum is 43.

The square root of 3935431861 is about 62733.0204995742. The cubic root of 3935431861 is about 1578.8133830673.

The spelling of 3935431861 in words is "three billion, nine hundred thirty-five million, four hundred thirty-one thousand, eight hundred sixty-one".