30820825897 has 4 divisors (see below), whose sum is σ = 30821669460. Its totient is φ = 30819982336.

The previous prime is 30820825873. The next prime is 30820825933. The reversal of 30820825897 is 79852802803.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79852802803 = 73 ⋅1093874011.

It can be written as a sum of positive squares in 2 ways, for example, as 27323759401 + 3497066496 = 165299^2 + 59136^2 .

It is a cyclic number.

It is not a de Polignac number, because 30820825897 - 2²³ = 30812437289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30820825817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 364372 + ... + 440917.

It is an arithmetic number, because the mean of its divisors is an integer number (7705417365).

Almost surely, 2^30820825897 is an apocalyptic number.

It is an amenable number.

30820825897 is a deficient number, since it is larger than the sum of its proper divisors (843563).

30820825897 is an equidigital number, since it uses as much as digits as its factorization.

30820825897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843562.

The product of its (nonzero) digits is 1935360, while the sum is 52.

The spelling of 30820825897 in words is "thirty billion, eight hundred twenty million, eight hundred twenty-five thousand, eight hundred ninety-seven".