921097 has 4 divisors (see below), whose sum is σ = 923796. Its totient is φ = 918400.

The previous prime is 921091. The next prime is 921121. The reversal of 921097 is 790129.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 790129 = 383 ⋅2063.

It can be written as a sum of positive squares in 2 ways, for example, as 741321 + 179776 = 861^2 + 424^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-921097 is a prime.

It is a Duffinian number.

921097 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 748 + ... + 1549.

It is an arithmetic number, because the mean of its divisors is an integer number (230949).

2⁹²¹⁰⁹⁷ is an apocalyptic number.

It is an amenable number.

921097 is a deficient number, since it is larger than the sum of its proper divisors (2699).

921097 is a wasteful number, since it uses less digits than its factorization.

921097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2698.

The product of its (nonzero) digits is 1134, while the sum is 28.

The square root of 921097 is about 959.7379850772. The cubic root of 921097 is about 97.2975241493.

The spelling of 921097 in words is "nine hundred twenty-one thousand, ninety-seven".