3891017965 has 16 divisors (see below), whose sum is σ = 4773061440. Its totient is φ = 3044257920.

The previous prime is 3891017947. The next prime is 3891017989. The reversal of 3891017965 is 5697101983.

It is not a de Polignac number, because 3891017965 - 2¹¹ = 3891015917 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4785 + ... + 88345.

It is an arithmetic number, because the mean of its divisors is an integer number (298316340).

Almost surely, 2^3891017965 is an apocalyptic number.

It is an amenable number.

3891017965 is a deficient number, since it is larger than the sum of its proper divisors (882043475).

3891017965 is a wasteful number, since it uses less digits than its factorization.

3891017965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83772.

The product of its (nonzero) digits is 408240, while the sum is 49.

The square root of 3891017965 is about 62378.0246962021. The cubic root of 3891017965 is about 1572.8515885940.

The spelling of 3891017965 in words is "three billion, eight hundred ninety-one million, seventeen thousand, nine hundred sixty-five".