30868181 has 4 divisors (see below), whose sum is σ = 31075500. Its totient is φ = 30660864.

The previous prime is 30868171. The next prime is 30868183. The reversal of 30868181 is 18186803.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18186803 = 293 ⋅62071.

It can be written as a sum of positive squares in 2 ways, for example, as 19945156 + 10923025 = 4466^2 + 3305^2 .

It is a cyclic number.

It is not a de Polignac number, because 30868181 - 2¹⁰ = 30867157 is a prime.

It is a super-2 number, since 2×30868181² = 1905689196497522, 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 (30868183) 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, 103436 + ... + 103733.

It is an arithmetic number, because the mean of its divisors is an integer number (7768875).

Almost surely, 2^30868181 is an apocalyptic number.

It is an amenable number.

30868181 is a deficient number, since it is larger than the sum of its proper divisors (207319).

30868181 is a wasteful number, since it uses less digits than its factorization.

30868181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207318.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 30868181 is about 5555.9140562107. The cubic root of 30868181 is about 313.6921706299.

The spelling of 30868181 in words is "thirty million, eight hundred sixty-eight thousand, one hundred eighty-one".