4001521871 has 2 divisors, whose sum is σ = 4001521872. Its totient is φ = 4001521870.

The previous prime is 4001521841. The next prime is 4001521879. The reversal of 4001521871 is 1781251004.

4001521871 is digitally balanced in base 2 and base 3, because in such bases 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 4001521871 - 2¹⁰ = 4001520847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4001521879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2000760935 + 2000760936.

It is an arithmetic number, because the mean of its divisors is an integer number (2000760936).

Almost surely, 2^4001521871 is an apocalyptic number.

4001521871 is a deficient number, since it is larger than the sum of its proper divisors (1).

4001521871 is an equidigital number, since it uses as much as digits as its factorization.

4001521871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 4001521871 is about 63257.5835058533. The cubic root of 4001521871 is about 1587.6023447441.

Adding to 4001521871 its reverse (1781251004), we get a palindrome (5782772875).

The spelling of 4001521871 in words is "four billion, one million, five hundred twenty-one thousand, eight hundred seventy-one".