921013 has 2 divisors, whose sum is σ = 921014. Its totient is φ = 921012.

The previous prime is 921007. The next prime is 921029. The reversal of 921013 is 310129.

It is an a-pointer prime, because the next prime (921029) can be obtained adding 921013 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 917764 + 3249 = 958^2 + 57^2 .

It is an emirp because it is prime and its reverse (310129) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 921013 - 2¹⁷ = 789941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (921073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460506 + 460507.

It is an arithmetic number, because the mean of its divisors is an integer number (460507).

2⁹²¹⁰¹³ is an apocalyptic number.

It is an amenable number.

921013 is a deficient number, since it is larger than the sum of its proper divisors (1).

921013 is an equidigital number, since it uses as much as digits as its factorization.

921013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 921013 is about 959.6942221354. The cubic root of 921013 is about 97.2945663571.

The spelling of 921013 in words is "nine hundred twenty-one thousand, thirteen".