921913 has 2 divisors, whose sum is σ = 921914. Its totient is φ = 921912.

The previous prime is 921911. The next prime is 921919. The reversal of 921913 is 319129.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 565504 + 356409 = 752^2 + 597^2 .

It is an emirp because it is prime and its reverse (319129) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 921913 - 2¹ = 921911 is a prime.

Together with 921911, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (921911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460956 + 460957.

It is an arithmetic number, because the mean of its divisors is an integer number (460957).

2⁹²¹⁹¹³ is an apocalyptic number.

It is an amenable number.

921913 is a deficient number, since it is larger than the sum of its proper divisors (1).

921913 is an equidigital number, since it uses as much as digits as its factorization.

921913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 486, while the sum is 25.

The square root of 921913 is about 960.1630069941. The cubic root of 921913 is about 97.3262476337.

The spelling of 921913 in words is "nine hundred twenty-one thousand, nine hundred thirteen".