3971182991 has 4 divisors (see below), whose sum is σ = 4025582832. Its totient is φ = 3916783152.

The previous prime is 3971182973. The next prime is 3971182997. The reversal of 3971182991 is 1992811793.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3971182991 - 2⁶ = 3971182927 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 (3971182997) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 27199811 + ... + 27199956.

It is an arithmetic number, because the mean of its divisors is an integer number (1006395708).

Almost surely, 2^3971182991 is an apocalyptic number.

3971182991 is a deficient number, since it is larger than the sum of its proper divisors (54399841).

3971182991 is an equidigital number, since it uses as much as digits as its factorization.

3971182991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54399840.

The product of its digits is 244944, while the sum is 50.

The square root of 3971182991 is about 63017.3229437748. The cubic root of 3971182991 is about 1583.5798483860.

The spelling of 3971182991 in words is "three billion, nine hundred seventy-one million, one hundred eighty-two thousand, nine hundred ninety-one".