1630411621 has 2 divisors, whose sum is σ = 1630411622. Its totient is φ = 1630411620.

The previous prime is 1630411561. The next prime is 1630411633. The reversal of 1630411621 is 1261140361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1278849121 + 351562500 = 35761^2 + 18750^2 .

It is a cyclic number.

It is not a de Polignac number, because 1630411621 - 2²¹ = 1628314469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1630411681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815205810 + 815205811.

It is an arithmetic number, because the mean of its divisors is an integer number (815205811).

Almost surely, 2^1630411621 is an apocalyptic number.

It is an amenable number.

1630411621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1630411621 is an equidigital number, since it uses as much as digits as its factorization.

1630411621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1630411621 is about 40378.3558481521. The cubic root of 1630411621 is about 1176.9709780194.

Adding to 1630411621 its reverse (1261140361), we get a palindrome (2891551982).

The spelling of 1630411621 in words is "one billion, six hundred thirty million, four hundred eleven thousand, six hundred twenty-one".