30168081 has 24 divisors (see below), whose sum is σ = 46374120. Its totient is φ = 18832896.

The previous prime is 30168079. The next prime is 30168097. The reversal of 30168081 is 18086103.

It can be written as a sum of positive squares in 4 ways, for example, as 9511056 + 20657025 = 3084^2 + 4545^2 .

It is not a de Polignac number, because 30168081 - 2¹ = 30168079 is a prime.

It is a super-2 number, since 2×30168081² = 1820226222445122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (30168001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40791 + ... + 41523.

It is an arithmetic number, because the mean of its divisors is an integer number (1932255).

Almost surely, 2^30168081 is an apocalyptic number.

It is an amenable number.

30168081 is a deficient number, since it is larger than the sum of its proper divisors (16206039).

30168081 is a wasteful number, since it uses less digits than its factorization.

30168081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025 (or 1022 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 30168081 is about 5492.5477694782. The cubic root of 30168081 is about 311.3024665993.

The spelling of 30168081 in words is "thirty million, one hundred sixty-eight thousand, eighty-one".