4001621671 has 2 divisors, whose sum is σ = 4001621672. Its totient is φ = 4001621670.

The previous prime is 4001621651. The next prime is 4001621731. The reversal of 4001621671 is 1761261004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4001621671 - 2⁷ = 4001621543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4001621651) 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 as a sum of consecutive naturals, namely, 2000810835 + 2000810836.

It is an arithmetic number, because the mean of its divisors is an integer number (2000810836).

Almost surely, 2^4001621671 is an apocalyptic number.

4001621671 is a deficient number, since it is larger than the sum of its proper divisors (1).

4001621671 is an equidigital number, since it uses as much as digits as its factorization.

4001621671 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 4001621671 is about 63258.3723391616. The cubic root of 4001621671 is about 1587.6155431722.

Adding to 4001621671 its reverse (1761261004), we get a palindrome (5762882675).

The spelling of 4001621671 in words is "four billion, one million, six hundred twenty-one thousand, six hundred seventy-one".