3971651 has 2 divisors, whose sum is σ = 3971652. Its totient is φ = 3971650.

The previous prime is 3971621. The next prime is 3971677. The reversal of 3971651 is 1561793.

3971651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3971651 - 2⁶ = 3971587 is a prime.

It is not a weakly prime, because it can be changed into another prime (3971621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1985825 + 1985826.

It is an arithmetic number, because the mean of its divisors is an integer number (1985826).

Almost surely, 2^3971651 is an apocalyptic number.

3971651 is a deficient number, since it is larger than the sum of its proper divisors (1).

3971651 is an equidigital number, since it uses as much as digits as its factorization.

3971651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5670, while the sum is 32.

The square root of 3971651 is about 1992.9001480255. The cubic root of 3971651 is about 158.3642054913.

It can be divided in two parts, 397 and 1651, that added together give a 11-th power (2048 = 2¹¹).

The spelling of 3971651 in words is "three million, nine hundred seventy-one thousand, six hundred fifty-one".