1630442217 has 4 divisors (see below), whose sum is σ = 2173922960. Its totient is φ = 1086961476.

The previous prime is 1630442213. The next prime is 1630442243. The reversal of 1630442217 is 7122440361.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7122440361 = 3 ⋅2374146787.

It is not a de Polignac number, because 1630442217 - 2² = 1630442213 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1630442213) 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, 271740367 + ... + 271740372.

It is an arithmetic number, because the mean of its divisors is an integer number (543480740).

Almost surely, 2^1630442217 is an apocalyptic number.

It is an amenable number.

1630442217 is a deficient number, since it is larger than the sum of its proper divisors (543480743).

1630442217 is an equidigital number, since it uses as much as digits as its factorization.

1630442217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543480742.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 1630442217 is about 40378.7347127173. The cubic root of 1630442217 is about 1176.9783402459.

Adding to 1630442217 its reverse (7122440361), we get a palindrome (8752882578).

The spelling of 1630442217 in words is "one billion, six hundred thirty million, four hundred forty-two thousand, two hundred seventeen".