921263617 has 2 divisors, whose sum is σ = 921263618. Its totient is φ = 921263616.

The previous prime is 921263599. The next prime is 921263627. The reversal of 921263617 is 716362129.

921263617 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 529184016 + 392079601 = 23004^2 + 19801^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-921263617 is a prime.

It is not a weakly prime, because it can be changed into another prime (921263627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460631808 + 460631809.

It is an arithmetic number, because the mean of its divisors is an integer number (460631809).

Almost surely, 2^921263617 is an apocalyptic number.

It is an amenable number.

921263617 is a deficient number, since it is larger than the sum of its proper divisors (1).

921263617 is an equidigital number, since it uses as much as digits as its factorization.

921263617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 37.

The square root of 921263617 is about 30352.3247379834. The cubic root of 921263617 is about 973.0339050367.

The spelling of 921263617 in words is "nine hundred twenty-one million, two hundred sixty-three thousand, six hundred seventeen".