30771161 has 4 divisors (see below), whose sum is σ = 31602852. Its totient is φ = 29939472.

The previous prime is 30771149. The next prime is 30771163. The reversal of 30771161 is 16117703.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22505536 + 8265625 = 4744^2 + 2875^2 .

It is a cyclic number.

It is not a de Polignac number, because 30771161 - 2²² = 26576857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 30771161.

It is not an unprimeable number, because it can be changed into a prime (30771163) 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, 415790 + ... + 415863.

It is an arithmetic number, because the mean of its divisors is an integer number (7900713).

Almost surely, 2^30771161 is an apocalyptic number.

It is an amenable number.

30771161 is a deficient number, since it is larger than the sum of its proper divisors (831691).

30771161 is an equidigital number, since it uses as much as digits as its factorization.

30771161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831690.

The product of its (nonzero) digits is 882, while the sum is 26.

The square root of 30771161 is about 5547.1759481740. The cubic root of 30771161 is about 313.3631764493.

Adding to 30771161 its reverse (16117703), we get a palindrome (46888864).

The spelling of 30771161 in words is "thirty million, seven hundred seventy-one thousand, one hundred sixty-one".