1630388317 has 4 divisors (see below), whose sum is σ = 1630536796. Its totient is φ = 1630239840.

The previous prime is 1630388293. The next prime is 1630388341. The reversal of 1630388317 is 7138830361.

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

It is an interprime number because it is at equal distance from previous prime (1630388293) and next prime (1630388341).

It can be written as a sum of positive squares in 2 ways, for example, as 810768676 + 819619641 = 28474^2 + 28629^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1630388317 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1630388317.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1630389317) 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, 56328 + ... + 80209.

It is an arithmetic number, because the mean of its divisors is an integer number (407634199).

Almost surely, 2^1630388317 is an apocalyptic number.

It is an amenable number.

1630388317 is a deficient number, since it is larger than the sum of its proper divisors (148479).

1630388317 is a wasteful number, since it uses less digits than its factorization.

1630388317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148478.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 1630388317 is about 40378.0672766788. The cubic root of 1630388317 is about 1176.9653703839.

The spelling of 1630388317 in words is "one billion, six hundred thirty million, three hundred eighty-eight thousand, three hundred seventeen".