30868391 has 2 divisors, whose sum is σ = 30868392. Its totient is φ = 30868390.

The previous prime is 30868351. The next prime is 30868393. The reversal of 30868391 is 19386803.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 30868391 - 2¹⁰ = 30867367 is a prime.

It is a Sophie Germain prime.

Together with 30868393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30868393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15434195 + 15434196.

It is an arithmetic number, because the mean of its divisors is an integer number (15434196).

Almost surely, 2^30868391 is an apocalyptic number.

30868391 is a deficient number, since it is larger than the sum of its proper divisors (1).

30868391 is an equidigital number, since it uses as much as digits as its factorization.

30868391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 30868391 is about 5555.9329549590. The cubic root of 30868391 is about 313.6928819903.

The spelling of 30868391 in words is "thirty million, eight hundred sixty-eight thousand, three hundred ninety-one".