30638238209 has 2 divisors, whose sum is σ = 30638238210. Its totient is φ = 30638238208.

The previous prime is 30638238203. The next prime is 30638238233. The reversal of 30638238209 is 90283283603.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18478324225 + 12159913984 = 135935^2 + 110272^2 .

It is a cyclic number.

It is not a de Polignac number, because 30638238209 - 2²⁸ = 30369802753 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30638238209.

It is not a weakly prime, because it can be changed into another prime (30638238203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15319119104 + 15319119105.

It is an arithmetic number, because the mean of its divisors is an integer number (15319119105).

Almost surely, 2^30638238209 is an apocalyptic number.

It is an amenable number.

30638238209 is a deficient number, since it is larger than the sum of its proper divisors (1).

30638238209 is an equidigital number, since it uses as much as digits as its factorization.

30638238209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 44.

The spelling of 30638238209 in words is "thirty billion, six hundred thirty-eight million, two hundred thirty-eight thousand, two hundred nine".