921553793 has 16 divisors (see below), whose sum is σ = 968274000. Its totient is φ = 875922432.

The previous prime is 921553781. The next prime is 921553807. The reversal of 921553793 is 397355129.

It can be written as a sum of positive squares in 8 ways, for example, as 24671089 + 896882704 = 4967^2 + 29948^2 .

It is a cyclic number.

It is not a de Polignac number, because 921553793 - 2⁴ = 921553777 is a prime.

It is a super-2 number, since 2×921553793² = 1698522786785373698, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (921553093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 714293 + ... + 715581.

It is an arithmetic number, because the mean of its divisors is an integer number (60517125).

Almost surely, 2^921553793 is an apocalyptic number.

It is an amenable number.

921553793 is a deficient number, since it is larger than the sum of its proper divisors (46720207).

921553793 is a wasteful number, since it uses less digits than its factorization.

921553793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1684.

The product of its digits is 255150, while the sum is 44.

The square root of 921553793 is about 30357.1044897237. The cubic root of 921553793 is about 973.1360551132.

The spelling of 921553793 in words is "nine hundred twenty-one million, five hundred fifty-three thousand, seven hundred ninety-three".