30968321 has 4 divisors (see below), whose sum is σ = 30980052. Its totient is φ = 30956592.

The previous prime is 30968303. The next prime is 30968341. The reversal of 30968321 is 12386903.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12386903 = 23 ⋅538561.

It can be written as a sum of positive squares in 2 ways, for example, as 20976400 + 9991921 = 4580^2 + 3161^2 .

It is a cyclic number.

It is not a de Polignac number, because 30968321 - 2⁶ = 30968257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (30968341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155 + ... + 7871.

It is an arithmetic number, because the mean of its divisors is an integer number (7745013).

Almost surely, 2^30968321 is an apocalyptic number.

It is an amenable number.

30968321 is a deficient number, since it is larger than the sum of its proper divisors (11731).

30968321 is an equidigital number, since it uses as much as digits as its factorization.

30968321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11730.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 30968321 is about 5564.9187774845. The cubic root of 30968321 is about 314.0310225344.

The spelling of 30968321 in words is "thirty million, nine hundred sixty-eight thousand, three hundred twenty-one".