3991546873 has 2 divisors, whose sum is σ = 3991546874. Its totient is φ = 3991546872.

The previous prime is 3991546843. The next prime is 3991546877. The reversal of 3991546873 is 3786451993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3887771904 + 103774969 = 62352^2 + 10187^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3991546873 is a prime.

It is not a weakly prime, because it can be changed into another prime (3991546877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1995773436 + 1995773437.

It is an arithmetic number, because the mean of its divisors is an integer number (1995773437).

Almost surely, 2^3991546873 is an apocalyptic number.

It is an amenable number.

3991546873 is a deficient number, since it is larger than the sum of its proper divisors (1).

3991546873 is an equidigital number, since it uses as much as digits as its factorization.

3991546873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4898880, while the sum is 55.

The square root of 3991546873 is about 63178.6900228234. The cubic root of 3991546873 is about 1586.2820547878.

The spelling of 3991546873 in words is "three billion, nine hundred ninety-one million, five hundred forty-six thousand, eight hundred seventy-three".