3971189969 has 2 divisors, whose sum is σ = 3971189970. Its totient is φ = 3971189968.

The previous prime is 3971189939. The next prime is 3971189977. The reversal of 3971189969 is 9699811793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3786556225 + 184633744 = 61535^2 + 13588^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3971189969 is a prime.

It is a super-2 number, since 2×3971189969² = 31540699539772441922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3971189939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1985594984 + 1985594985.

It is an arithmetic number, because the mean of its divisors is an integer number (1985594985).

Almost surely, 2^3971189969 is an apocalyptic number.

It is an amenable number.

3971189969 is a deficient number, since it is larger than the sum of its proper divisors (1).

3971189969 is an equidigital number, since it uses as much as digits as its factorization.

3971189969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6613488, while the sum is 62.

The square root of 3971189969 is about 63017.3783094790. The cubic root of 3971189969 is about 1583.5807759193.

The spelling of 3971189969 in words is "three billion, nine hundred seventy-one million, one hundred eighty-nine thousand, nine hundred sixty-nine".