30918081 has 16 divisors (see below), whose sum is σ = 41981184. Its totient is φ = 20236944.

The previous prime is 30918079. The next prime is 30918091. The reversal of 30918081 is 18081903.

It is not a de Polignac number, because 30918081 - 2¹ = 30918079 is a prime.

It is a super-2 number, since 2×30918081² = 1911855465445122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (30918061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56250 + ... + 56796.

It is an arithmetic number, because the mean of its divisors is an integer number (2623824).

Almost surely, 2^30918081 is an apocalyptic number.

It is an amenable number.

30918081 is a deficient number, since it is larger than the sum of its proper divisors (11063103).

30918081 is a wasteful number, since it uses less digits than its factorization.

30918081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 30918081 is about 5560.4029530242. The cubic root of 30918081 is about 313.8611127964.

Adding to 30918081 its reverse (18081903), we get a palindrome (48999984).

The spelling of 30918081 in words is "thirty million, nine hundred eighteen thousand, eighty-one".