1630003621 has 2 divisors, whose sum is σ = 1630003622. Its totient is φ = 1630003620.

The previous prime is 1630003589. The next prime is 1630003637. The reversal of 1630003621 is 1263000361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1598800225 + 31203396 = 39985^2 + 5586^2 .

It is a cyclic number.

It is not a de Polignac number, because 1630003621 - 2⁵ = 1630003589 is a prime.

It is a super-2 number, since 2×1630003621² = 5313823608946223282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1630003592 and 1630003601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1630003321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815001810 + 815001811.

It is an arithmetic number, because the mean of its divisors is an integer number (815001811).

Almost surely, 2^1630003621 is an apocalyptic number.

It is an amenable number.

1630003621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1630003621 is an equidigital number, since it uses as much as digits as its factorization.

1630003621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 1630003621 is about 40373.3033203873. The cubic root of 1630003621 is about 1176.8727933617.

Adding to 1630003621 its reverse (1263000361), we get a palindrome (2893003982).

The spelling of 1630003621 in words is "one billion, six hundred thirty million, three thousand, six hundred twenty-one".