30085861 has 4 divisors (see below), whose sum is σ = 32400172. Its totient is φ = 27771552.

The previous prime is 30085849. The next prime is 30085879. The reversal of 30085861 is 16858003.

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 12496225 + 17589636 = 3535^2 + 4194^2 .

It is a cyclic number.

It is not a de Polignac number, because 30085861 - 2¹¹ = 30083813 is a prime.

It is a super-2 number, since 2×30085861² = 1810318064222642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30085831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1157136 + ... + 1157161.

It is an arithmetic number, because the mean of its divisors is an integer number (8100043).

Almost surely, 2^30085861 is an apocalyptic number.

It is an amenable number.

30085861 is a deficient number, since it is larger than the sum of its proper divisors (2314311).

30085861 is a wasteful number, since it uses less digits than its factorization.

30085861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2314310.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 30085861 is about 5485.0579759926. The cubic root of 30085861 is about 311.0194016769.

The spelling of 30085861 in words is "thirty million, eighty-five thousand, eight hundred sixty-one".