30216681 has 12 divisors (see below), whose sum is σ = 47614320. Its totient is φ = 18313080.

The previous prime is 30216649. The next prime is 30216709. The reversal of 30216681 is 18661203.

It is not a de Polignac number, because 30216681 - 2⁵ = 30216649 is a prime.

It is a super-2 number, since 2×30216681² = 1826095621311522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (30216601) 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 11 ways as a sum of consecutive naturals, for example, 152511 + ... + 152708.

It is an arithmetic number, because the mean of its divisors is an integer number (3967860).

Almost surely, 2^30216681 is an apocalyptic number.

It is an amenable number.

30216681 is a deficient number, since it is larger than the sum of its proper divisors (17397639).

30216681 is a wasteful number, since it uses less digits than its factorization.

30216681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305236 (or 305233 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 30216681 is about 5496.9701654639. The cubic root of 30216681 is about 311.4695436593.

Adding to 30216681 its reverse (18661203), we get a palindrome (48877884).

The spelling of 30216681 in words is "thirty million, two hundred sixteen thousand, six hundred eighty-one".