1630212305 has 4 divisors (see below), whose sum is σ = 1956254772. Its totient is φ = 1304169840.

The previous prime is 1630212301. The next prime is 1630212329. The reversal of 1630212305 is 5032120361.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1026625681 + 603586624 = 32041^2 + 24568^2 .

It is not a de Polignac number, because 1630212305 - 2² = 1630212301 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1630212301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163021226 + ... + 163021235.

It is an arithmetic number, because the mean of its divisors is an integer number (489063693).

Almost surely, 2^1630212305 is an apocalyptic number.

It is an amenable number.

1630212305 is a deficient number, since it is larger than the sum of its proper divisors (326042467).

1630212305 is an equidigital number, since it uses as much as digits as its factorization.

1630212305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326042466.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 1630212305 is about 40375.8876682606. The cubic root of 1630212305 is about 1176.9230149356.

Adding to 1630212305 its reverse (5032120361), we get a palindrome (6662332666).

The spelling of 1630212305 in words is "one billion, six hundred thirty million, two hundred twelve thousand, three hundred five".