30457813 has 2 divisors, whose sum is σ = 30457814. Its totient is φ = 30457812.

The previous prime is 30457811. The next prime is 30457831. The reversal of 30457813 is 31875403.

Together with next prime (30457831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16184529 + 14273284 = 4023^2 + 3778^2 .

It is a cyclic number.

It is not a de Polignac number, because 30457813 - 2¹ = 30457811 is a prime.

Together with 30457811, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30457811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15228906 + 15228907.

It is an arithmetic number, because the mean of its divisors is an integer number (15228907).

Almost surely, 2^30457813 is an apocalyptic number.

It is an amenable number.

30457813 is a deficient number, since it is larger than the sum of its proper divisors (1).

30457813 is an equidigital number, since it uses as much as digits as its factorization.

30457813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 30457813 is about 5518.8597554205. The cubic root of 30457813 is about 312.2958683926.

The spelling of 30457813 in words is "thirty million, four hundred fifty-seven thousand, eight hundred thirteen".