809121 has 8 divisors (see below), whose sum is σ = 1085760. Its totient is φ = 535952.

The previous prime is 809101. The next prime is 809141. The reversal of 809121 is 121908.

It is an interprime number because it is at equal distance from previous prime (809101) and next prime (809141).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 809121 - 2⁷ = 808993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (809101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 261 + ... + 1298.

It is an arithmetic number, because the mean of its divisors is an integer number (135720).

2⁸⁰⁹¹²¹ is an apocalyptic number.

It is an amenable number.

809121 is a deficient number, since it is larger than the sum of its proper divisors (276639).

809121 is a wasteful number, since it uses less digits than its factorization.

809121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1735.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 809121 is about 899.5115341117. The cubic root of 809121 is about 93.1832437472.

The spelling of 809121 in words is "eight hundred nine thousand, one hundred twenty-one".