1001320023 has 16 divisors (see below), whose sum is σ = 1474905600. Its totient is φ = 599177280.

The previous prime is 1001320013. The next prime is 1001320027. The reversal of 1001320023 is 3200231001.

It is a happy number.

It is not a de Polignac number, because 1001320023 - 2¹⁰ = 1001318999 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1001319990 and 1001320008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001320027) 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, 189438 + ... + 194651.

It is an arithmetic number, because the mean of its divisors is an integer number (92181600).

Almost surely, 2^1001320023 is an apocalyptic number.

1001320023 is a deficient number, since it is larger than the sum of its proper divisors (473585577).

1001320023 is a wasteful number, since it uses less digits than its factorization.

1001320023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384182.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 1001320023 is about 31643.6411147643. The cubic root of 1001320023 is about 1000.4398142018.

Adding to 1001320023 its reverse (3200231001), we get a palindrome (4201551024).

It can be divided in two parts, 1001 and 320023, that multiplied together give a palindrome (320343023).

The spelling of 1001320023 in words is "one billion, one million, three hundred twenty thousand, twenty-three".