2001323965 has 4 divisors (see below), whose sum is σ = 2401588764. Its totient is φ = 1601059168.

The previous prime is 2001323957. The next prime is 2001323977. The reversal of 2001323965 is 5693231002.

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

It can be written as a sum of positive squares in 2 ways, for example, as 847159236 + 1154164729 = 29106^2 + 33973^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001323965 - 2³ = 2001323957 is a prime.

It is a super-2 number, since 2×2001323965² = 8010595225766642450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200132392 + ... + 200132401.

It is an arithmetic number, because the mean of its divisors is an integer number (600397191).

Almost surely, 2^2001323965 is an apocalyptic number.

It is an amenable number.

2001323965 is a deficient number, since it is larger than the sum of its proper divisors (400264799).

2001323965 is an equidigital number, since it uses as much as digits as its factorization.

2001323965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400264798.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 2001323965 is about 44736.1594797765. The cubic root of 2001323965 is about 1260.1990037992.

Adding to 2001323965 its reverse (5693231002), we get a palindrome (7694554967).

The spelling of 2001323965 in words is "two billion, one million, three hundred twenty-three thousand, nine hundred sixty-five".