3971533 has 2 divisors, whose sum is σ = 3971534. Its totient is φ = 3971532.

The previous prime is 3971531. The next prime is 3971537. The reversal of 3971533 is 3351793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3912484 + 59049 = 1978^2 + 243^2 .

It is a cyclic number.

It is not a de Polignac number, because 3971533 - 2¹ = 3971531 is a prime.

Together with 3971531, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 3971495 and 3971504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3971531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1985766 + 1985767.

It is an arithmetic number, because the mean of its divisors is an integer number (1985767).

Almost surely, 2^3971533 is an apocalyptic number.

It is an amenable number.

3971533 is a deficient number, since it is larger than the sum of its proper divisors (1).

3971533 is an equidigital number, since it uses as much as digits as its factorization.

3971533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8505, while the sum is 31.

The square root of 3971533 is about 1992.8705427097. The cubic root of 3971533 is about 158.3626371124.

The spelling of 3971533 in words is "three million, nine hundred seventy-one thousand, five hundred thirty-three".