921365317 has 2 divisors, whose sum is σ = 921365318. Its totient is φ = 921365316.

The previous prime is 921365287. The next prime is 921365327. The reversal of 921365317 is 713563129.

It is a Cunningham number, because it is equal to 30354²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 921365316 + 1 = 30354^2 + 1^2 .

It is an emirp because it is prime and its reverse (713563129) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 921365317 - 2⁷ = 921365189 is a prime.

It is equal to p_47045764 and since 921365317 and 47045764 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (921365327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460682658 + 460682659.

It is an arithmetic number, because the mean of its divisors is an integer number (460682659).

Almost surely, 2^921365317 is an apocalyptic number.

It is an amenable number.

921365317 is a deficient number, since it is larger than the sum of its proper divisors (1).

921365317 is an equidigital number, since it uses as much as digits as its factorization.

921365317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34020, while the sum is 37.

The square root of 921365317 is about 30354.0000164723. Note that the first 4 decimals coincide. The cubic root of 921365317 is about 973.0697087253.

The spelling of 921365317 in words is "nine hundred twenty-one million, three hundred sixty-five thousand, three hundred seventeen".