1001073721 has 8 divisors (see below), whose sum is σ = 1011650688. Its totient is φ = 990510000.

The previous prime is 1001073719. The next prime is 1001073743. The reversal of 1001073721 is 1273701001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1001073721 - 2¹ = 1001073719 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001073692 and 1001073701.

It is not an unprimeable number, because it can be changed into a prime (1001076721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241456 + ... + 245566.

It is an arithmetic number, because the mean of its divisors is an integer number (126456336).

Almost surely, 2^1001073721 is an apocalyptic number.

It is an amenable number.

1001073721 is a deficient number, since it is larger than the sum of its proper divisors (10576967).

1001073721 is a wasteful number, since it uses less digits than its factorization.

1001073721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6623.

The product of its (nonzero) digits is 294, while the sum is 22.

The square root of 1001073721 is about 31639.7490666408. The cubic root of 1001073721 is about 1000.3577789789.

Adding to 1001073721 its reverse (1273701001), we get a palindrome (2274774722).

The spelling of 1001073721 in words is "one billion, one million, seventy-three thousand, seven hundred twenty-one".