921259 has 2 divisors, whose sum is σ = 921260. Its totient is φ = 921258.

The previous prime is 921257. The next prime is 921287. The reversal of 921259 is 952129.

It is an a-pointer prime, because the next prime (921287) can be obtained adding 921259 to its sum of digits (28).

It is a weak prime.

It is an emirp because it is prime and its reverse (952129) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 921259 - 2¹ = 921257 is a prime.

Together with 921257, it forms a pair of twin primes.

921259 is a lucky number.

It is equal to p₇₂₈₂₉ and since 921259 and 72829 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (921257) 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, 460629 + 460630.

It is an arithmetic number, because the mean of its divisors is an integer number (460630).

2⁹²¹²⁵⁹ is an apocalyptic number.

921259 is a deficient number, since it is larger than the sum of its proper divisors (1).

921259 is an equidigital number, since it uses as much as digits as its factorization.

921259 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1620, while the sum is 28.

The square root of 921259 is about 959.8223794015. The cubic root of 921259 is about 97.3032279550.

The spelling of 921259 in words is "nine hundred twenty-one thousand, two hundred fifty-nine".