921497 has 2 divisors, whose sum is σ = 921498. Its totient is φ = 921496.

The previous prime is 921491. The next prime is 921499. The reversal of 921497 is 794129.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 687241 + 234256 = 829^2 + 484^2 .

It is a cyclic number.

It is not a de Polignac number, because 921497 - 2⁸ = 921241 is a prime.

Together with 921499, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (921491) 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, 460748 + 460749.

It is an arithmetic number, because the mean of its divisors is an integer number (460749).

2⁹²¹⁴⁹⁷ is an apocalyptic number.

It is an amenable number.

921497 is a deficient number, since it is larger than the sum of its proper divisors (1).

921497 is an equidigital number, since it uses as much as digits as its factorization.

921497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 32.

The square root of 921497 is about 959.9463526677. The cubic root of 921497 is about 97.3116064075.

The spelling of 921497 in words is "nine hundred twenty-one thousand, four hundred ninety-seven".