1630121605 has 16 divisors (see below), whose sum is σ = 2272247424. Its totient is φ = 1099471680.

The previous prime is 1630121531. The next prime is 1630121611. The reversal of 1630121605 is 5061210361.

It is not a de Polignac number, because 1630121605 - 2¹⁷ = 1629990533 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1630121605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 379627 + ... + 383896.

It is an arithmetic number, because the mean of its divisors is an integer number (142015464).

Almost surely, 2^1630121605 is an apocalyptic number.

It is an amenable number.

1630121605 is a deficient number, since it is larger than the sum of its proper divisors (642125819).

1630121605 is an equidigital number, since it uses as much as digits as its factorization.

1630121605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763596.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 1630121605 is about 40374.7644575173. The cubic root of 1630121605 is about 1176.9011877383.

Adding to 1630121605 its reverse (5061210361), we get a palindrome (6691331966).

The spelling of 1630121605 in words is "one billion, six hundred thirty million, one hundred twenty-one thousand, six hundred five".