4001215771 has 4 divisors (see below), whose sum is σ = 4572818032. Its totient is φ = 3429613512.

The previous prime is 4001215733. The next prime is 4001215783. The reversal of 4001215771 is 1775121004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 4001215771 - 2⁹ = 4001215259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4001215711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 285801120 + ... + 285801133.

It is an arithmetic number, because the mean of its divisors is an integer number (1143204508).

Almost surely, 2^4001215771 is an apocalyptic number.

4001215771 is a deficient number, since it is larger than the sum of its proper divisors (571602261).

4001215771 is an equidigital number, since it uses as much as digits as its factorization.

4001215771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571602260.

The product of its (nonzero) digits is 1960, while the sum is 28.

The square root of 4001215771 is about 63255.1639868240. The cubic root of 4001215771 is about 1587.5618620240.

Adding to 4001215771 its reverse (1775121004), we get a palindrome (5776336775).

The spelling of 4001215771 in words is "four billion, one million, two hundred fifteen thousand, seven hundred seventy-one".