4001020331 has 16 divisors (see below), whose sum is σ = 5018903808. Its totient is φ = 3098541600.

The previous prime is 4001020327. The next prime is 4001020337. The reversal of 4001020331 is 1330201004.

It is not a de Polignac number, because 4001020331 - 2² = 4001020327 is a prime.

It is a super-2 number, since 2×4001020331² = 32016327378150699122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4001020337) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146840 + ... + 171941.

It is an arithmetic number, because the mean of its divisors is an integer number (313681488).

Almost surely, 2^4001020331 is an apocalyptic number.

4001020331 is a deficient number, since it is larger than the sum of its proper divisors (1017883477).

4001020331 is a wasteful number, since it uses less digits than its factorization.

4001020331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318962.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 4001020331 is about 63253.6191138499. The cubic root of 4001020331 is about 1587.5360133686.

Adding to 4001020331 its reverse (1330201004), we get a palindrome (5331221335).

The spelling of 4001020331 in words is "four billion, one million, twenty thousand, three hundred thirty-one".