921630945 has 16 divisors (see below), whose sum is σ = 1561351680. Its totient is φ = 462622464.

The previous prime is 921630937. The next prime is 921630947. The reversal of 921630945 is 549036129.

It is not a de Polignac number, because 921630945 - 2³ = 921630937 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (921630947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1806865 + ... + 1807374.

It is an arithmetic number, because the mean of its divisors is an integer number (97584480).

Almost surely, 2^921630945 is an apocalyptic number.

It is an amenable number.

921630945 is a deficient number, since it is larger than the sum of its proper divisors (639720735).

921630945 is a wasteful number, since it uses less digits than its factorization.

921630945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3614264.

The product of its (nonzero) digits is 58320, while the sum is 39.

The square root of 921630945 is about 30358.3752035579. The cubic root of 921630945 is about 973.1632111687.

The spelling of 921630945 in words is "nine hundred twenty-one million, six hundred thirty thousand, nine hundred forty-five".