3891391625 has 32 divisors (see below), whose sum is σ = 5304289536. Its totient is φ = 2826720000.

The previous prime is 3891391619. The next prime is 3891391663. The reversal of 3891391625 is 5261931983.

It is not a de Polignac number, because 3891391625 - 2⁶ = 3891391561 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3891391625.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2076689 + ... + 2078561.

It is an arithmetic number, because the mean of its divisors is an integer number (165759048).

Almost surely, 2^3891391625 is an apocalyptic number.

It is an amenable number.

3891391625 is a deficient number, since it is larger than the sum of its proper divisors (1412897911).

3891391625 is a wasteful number, since it uses less digits than its factorization.

3891391625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3410 (or 3400 counting only the distinct ones).

The product of its digits is 349920, while the sum is 47.

The square root of 3891391625 is about 62381.0197496001. The cubic root of 3891391625 is about 1572.9019347089.

The spelling of 3891391625 in words is "three billion, eight hundred ninety-one million, three hundred ninety-one thousand, six hundred twenty-five".