1002638621 has 2 divisors, whose sum is σ = 1002638622. Its totient is φ = 1002638620.

The previous prime is 1002638599. The next prime is 1002638669. The reversal of 1002638621 is 1268362001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 972816100 + 29822521 = 31190^2 + 5461^2 .

It is an emirp because it is prime and its reverse (1268362001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1002638621 - 2⁶ = 1002638557 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1002638671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 501319310 + 501319311.

It is an arithmetic number, because the mean of its divisors is an integer number (501319311).

Almost surely, 2^1002638621 is an apocalyptic number.

It is an amenable number.

1002638621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1002638621 is an equidigital number, since it uses as much as digits as its factorization.

1002638621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 1002638621 is about 31664.4693781532. The cubic root of 1002638621 is about 1000.8787678742.

The spelling of 1002638621 in words is "one billion, two million, six hundred thirty-eight thousand, six hundred twenty-one".