4002020191 has 32 divisors (see below), whose sum is σ = 4491305280. Its totient is φ = 3542482944.

The previous prime is 4002020177. The next prime is 4002020203. The reversal of 4002020191 is 1910202004.

4002020191 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-4002020191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4002020111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12785851 + ... + 12786163.

It is an arithmetic number, because the mean of its divisors is an integer number (140353290).

Almost surely, 2^4002020191 is an apocalyptic number.

4002020191 is a deficient number, since it is larger than the sum of its proper divisors (489285089).

4002020191 is a wasteful number, since it uses less digits than its factorization.

4002020191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 4002020191 is about 63261.5221995171. The cubic root of 4002020191 is about 1587.6682447681.

Adding to 4002020191 its reverse (1910202004), we get a palindrome (5912222195).

The spelling of 4002020191 in words is "four billion, two million, twenty thousand, one hundred ninety-one".