30819206909 has 2 divisors, whose sum is σ = 30819206910. Its totient is φ = 30819206908.

The previous prime is 30819206881. The next prime is 30819206939. The reversal of 30819206909 is 90960291803.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20449858009 + 10369348900 = 143003^2 + 101830^2 .

It is an emirp because it is prime and its reverse (90960291803) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30819206909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30819206939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15409603454 + 15409603455.

It is an arithmetic number, because the mean of its divisors is an integer number (15409603455).

Almost surely, 2^30819206909 is an apocalyptic number.

It is an amenable number.

30819206909 is a deficient number, since it is larger than the sum of its proper divisors (1).

30819206909 is an equidigital number, since it uses as much as digits as its factorization.

30819206909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 209952, while the sum is 47.

The spelling of 30819206909 in words is "thirty billion, eight hundred nineteen million, two hundred six thousand, nine hundred nine".