30471809 has 2 divisors, whose sum is σ = 30471810. Its totient is φ = 30471808.

The previous prime is 30471761. The next prime is 30471811. The reversal of 30471809 is 90817403.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22061809 + 8410000 = 4697^2 + 2900^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30471809 is a prime.

It is a super-2 number, since 2×30471809² = 1857062287464962, which contains 22 as substring.

Together with 30471811, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (30471869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15235904 + 15235905.

It is an arithmetic number, because the mean of its divisors is an integer number (15235905).

Almost surely, 2^30471809 is an apocalyptic number.

It is an amenable number.

30471809 is a deficient number, since it is larger than the sum of its proper divisors (1).

30471809 is an equidigital number, since it uses as much as digits as its factorization.

30471809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 30471809 is about 5520.1276253362. The cubic root of 30471809 is about 312.3436965546.

The spelling of 30471809 in words is "thirty million, four hundred seventy-one thousand, eight hundred nine".