1630964809 has 4 divisors (see below), whose sum is σ = 1638149904. Its totient is φ = 1623779716.

The previous prime is 1630964791. The next prime is 1630964831. The reversal of 1630964809 is 9084690361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1630964809 - 2⁷ = 1630964681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1630964899) by changing a digit.

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, 3592207 + ... + 3592660.

It is an arithmetic number, because the mean of its divisors is an integer number (409537476).

Almost surely, 2^1630964809 is an apocalyptic number.

It is an amenable number.

1630964809 is a deficient number, since it is larger than the sum of its proper divisors (7185095).

1630964809 is an equidigital number, since it uses as much as digits as its factorization.

1630964809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7185094.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 1630964809 is about 40385.2053232369. The cubic root of 1630964809 is about 1177.1040758193.

It can be divided in two parts, 16309 and 64809, that added together give a palindrome (81118).

The spelling of 1630964809 in words is "one billion, six hundred thirty million, nine hundred sixty-four thousand, eight hundred nine".