853797121 has 4 divisors (see below), whose sum is σ = 873652912. Its totient is φ = 833941332.

The previous prime is 853797107. The next prime is 853797143. The reversal of 853797121 is 121797358.

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.

It is a cyclic number.

It is not a de Polignac number, because 853797121 - 2¹⁷ = 853666049 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 19855747 = 853797121 / (8 + 5 + 3 + 7 + 9 + 7 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (853797181) 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, 9927831 + ... + 9927916.

It is an arithmetic number, because the mean of its divisors is an integer number (218413228).

Almost surely, 2^853797121 is an apocalyptic number.

It is an amenable number.

853797121 is a deficient number, since it is larger than the sum of its proper divisors (19855791).

853797121 is a wasteful number, since it uses less digits than its factorization.

853797121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19855790.

The product of its digits is 105840, while the sum is 43.

The square root of 853797121 is about 29219.8069979937. The cubic root of 853797121 is about 948.6766879135.

The spelling of 853797121 in words is "eight hundred fifty-three million, seven hundred ninety-seven thousand, one hundred twenty-one".