30521865949 has 2 divisors, whose sum is σ = 30521865950. Its totient is φ = 30521865948.

The previous prime is 30521865947. The next prime is 30521865961. The reversal of 30521865949 is 94956812503.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24114984100 + 6406881849 = 155290^2 + 80043^2 .

It is a cyclic number.

It is not a de Polignac number, because 30521865949 - 2¹ = 30521865947 is a prime.

Together with 30521865947, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 30521865896 and 30521865905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30521865947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15260932974 + 15260932975.

It is an arithmetic number, because the mean of its divisors is an integer number (15260932975).

Almost surely, 2^30521865949 is an apocalyptic number.

It is an amenable number.

30521865949 is a deficient number, since it is larger than the sum of its proper divisors (1).

30521865949 is an equidigital number, since it uses as much as digits as its factorization.

30521865949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2332800, while the sum is 52.

The spelling of 30521865949 in words is "thirty billion, five hundred twenty-one million, eight hundred sixty-five thousand, nine hundred forty-nine".