30401209 has 2 divisors, whose sum is σ = 30401210. Its totient is φ = 30401208.

The previous prime is 30401207. The next prime is 30401221. The reversal of 30401209 is 90210403.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28783225 + 1617984 = 5365^2 + 1272^2 .

It is a cyclic number.

It is not a de Polignac number, because 30401209 - 2¹ = 30401207 is a prime.

Together with 30401207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (30401207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15200604 + 15200605.

It is an arithmetic number, because the mean of its divisors is an integer number (15200605).

Almost surely, 2^30401209 is an apocalyptic number.

It is an amenable number.

30401209 is a deficient number, since it is larger than the sum of its proper divisors (1).

30401209 is an equidigital number, since it uses as much as digits as its factorization.

30401209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 30401209 is about 5513.7291373443. The cubic root of 30401209 is about 312.1022874405.

The spelling of 30401209 in words is "thirty million, four hundred one thousand, two hundred nine".