921884663 has 4 divisors (see below), whose sum is σ = 1053582480. Its totient is φ = 790186848.

The previous prime is 921884659. The next prime is 921884699. The reversal of 921884663 is 366488129.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 366488129 = 7 ⋅52355447.

It is a cyclic number.

It is not a de Polignac number, because 921884663 - 2² = 921884659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921884633) 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, 65848898 + ... + 65848911.

It is an arithmetic number, because the mean of its divisors is an integer number (263395620).

Almost surely, 2^921884663 is an apocalyptic number.

921884663 is a deficient number, since it is larger than the sum of its proper divisors (131697817).

921884663 is a wasteful number, since it uses less digits than its factorization.

921884663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131697816.

The product of its digits is 497664, while the sum is 47.

The square root of 921884663 is about 30362.5536310766. The cubic root of 921884663 is about 973.2525044558.

The spelling of 921884663 in words is "nine hundred twenty-one million, eight hundred eighty-four thousand, six hundred sixty-three".