1001000621 has 2 divisors, whose sum is σ = 1001000622. Its totient is φ = 1001000620.

The previous prime is 1001000563. The next prime is 1001000677. The reversal of 1001000621 is 1260001001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 580135396 + 420865225 = 24086^2 + 20515^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001000621 - 2²⁶ = 933891757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001000321) 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 as a sum of consecutive naturals, namely, 500500310 + 500500311.

It is an arithmetic number, because the mean of its divisors is an integer number (500500311).

Almost surely, 2^1001000621 is an apocalyptic number.

It is an amenable number.

1001000621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001000621 is an equidigital number, since it uses as much as digits as its factorization.

1001000621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1001000621 is about 31638.5938530776. The cubic root of 1001000621 is about 1000.3334291460. Note that the first 3 decimals are identical.

Adding to 1001000621 its reverse (1260001001), we get a palindrome (2261001622).

The spelling of 1001000621 in words is "one billion, one million, six hundred twenty-one", and thus it is an aban number.