1630521217 has 8 divisors (see below), whose sum is σ = 1803404456. Its totient is φ = 1464417792.

The previous prime is 1630521199. The next prime is 1630521223. The reversal of 1630521217 is 7121250361.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 846577216 + 783944001 = 29096^2 + 27999^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1630521217 - 2²⁷ = 1496303489 is a prime.

It is a super-2 number, since 2×1630521217² = 5317198878174322178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1630521247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1694448 + ... + 1695409.

It is an arithmetic number, because the mean of its divisors is an integer number (225425557).

Almost surely, 2^1630521217 is an apocalyptic number.

It is an amenable number.

1630521217 is a deficient number, since it is larger than the sum of its proper divisors (172883239).

1630521217 is a wasteful number, since it uses less digits than its factorization.

1630521217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3389907.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 1630521217 is about 40379.7129385537. The cubic root of 1630521217 is about 1176.9973493601.

Adding to 1630521217 its reverse (7121250361), we get a palindrome (8751771578).

The spelling of 1630521217 in words is "one billion, six hundred thirty million, five hundred twenty-one thousand, two hundred seventeen".