1621630316 has 12 divisors (see below), whose sum is σ = 2987213880. Its totient is φ = 768140640.

The previous prime is 1621630291. The next prime is 1621630333. The reversal of 1621630316 is 6130361261.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10668545 + ... + 10668696.

It is an arithmetic number, because the mean of its divisors is an integer number (248934490).

Almost surely, 2^1621630316 is an apocalyptic number.

It is an amenable number.

1621630316 is a deficient number, since it is larger than the sum of its proper divisors (1365583564).

1621630316 is a wasteful number, since it uses less digits than its factorization.

1621630316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21337264 (or 21337262 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 1621630316 is about 40269.4712654636. The cubic root of 1621630316 is about 1174.8541399748.

Adding to 1621630316 its reverse (6130361261), we get a palindrome (7751991577).

The spelling of 1621630316 in words is "one billion, six hundred twenty-one million, six hundred thirty thousand, three hundred sixteen".