30851 has 2 divisors, whose sum is σ = 30852. Its totient is φ = 30850.

The previous prime is 30841. The next prime is 30853. The reversal of 30851 is 15803.

It is a strong prime.

It is an emirp because it is prime and its reverse (15803) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30851 is a prime.

It is a Sophie Germain prime.

Together with 30853, it forms a pair of twin primes.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 30851.

It is not a weakly prime, because it can be changed into another prime (30853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15425 + 15426.

It is an arithmetic number, because the mean of its divisors is an integer number (15426).

2³⁰⁸⁵¹ is an apocalyptic number.

30851 is a deficient number, since it is larger than the sum of its proper divisors (1).

30851 is an equidigital number, since it uses as much as digits as its factorization.

30851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 30851 is about 175.6445273841. The cubic root of 30851 is about 31.3633960252.

The spelling of 30851 in words is "thirty thousand, eight hundred fifty-one".