921697 has 4 divisors (see below), whose sum is σ = 1053376. Its totient is φ = 790020.

The previous prime is 921677. The next prime is 921703. The reversal of 921697 is 796129.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 796129 = 37 ⋅21517.

It is a de Polignac number, because none of the positive numbers 2^k-921697 is a prime.

It is a Duffinian number.

921697 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (921637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65829 + ... + 65842.

It is an arithmetic number, because the mean of its divisors is an integer number (263344).

2⁹²¹⁶⁹⁷ is an apocalyptic number.

It is an amenable number.

921697 is a deficient number, since it is larger than the sum of its proper divisors (131679).

921697 is a wasteful number, since it uses less digits than its factorization.

921697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131678.

The product of its digits is 6804, while the sum is 34.

The square root of 921697 is about 960.0505195041. The cubic root of 921697 is about 97.3186460084.

The spelling of 921697 in words is "nine hundred twenty-one thousand, six hundred ninety-seven".