1001076721 has 2 divisors, whose sum is σ = 1001076722. Its totient is φ = 1001076720.

The previous prime is 1001076719. The next prime is 1001076737. The reversal of 1001076721 is 1276701001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 994771600 + 6305121 = 31540^2 + 2511^2 .

It is an emirp because it is prime and its reverse (1276701001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1001076721 - 2¹ = 1001076719 is a prime.

It is a super-2 number, since 2×1001076721² = 2004309202656223682, which contains 22 as substring.

Together with 1001076719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1001076821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500538360 + 500538361.

It is an arithmetic number, because the mean of its divisors is an integer number (500538361).

Almost surely, 2^1001076721 is an apocalyptic number.

It is an amenable number.

1001076721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001076721 is an equidigital number, since it uses as much as digits as its factorization.

1001076721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 588, while the sum is 25.

The square root of 1001076721 is about 31639.7964753252. The cubic root of 1001076721 is about 1000.3587782628.

Adding to 1001076721 its reverse (1276701001), we get a palindrome (2277777722).

The spelling of 1001076721 in words is "one billion, one million, seventy-six thousand, seven hundred twenty-one".