30981502649 has 2 divisors, whose sum is σ = 30981502650. Its totient is φ = 30981502648.

The previous prime is 30981502637. The next prime is 30981502693. The reversal of 30981502649 is 94620518903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29423227024 + 1558275625 = 171532^2 + 39475^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30981502649 is a prime.

It is not a weakly prime, because it can be changed into another prime (30981502249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15490751324 + 15490751325.

It is an arithmetic number, because the mean of its divisors is an integer number (15490751325).

Almost surely, 2^30981502649 is an apocalyptic number.

It is an amenable number.

30981502649 is a deficient number, since it is larger than the sum of its proper divisors (1).

30981502649 is an equidigital number, since it uses as much as digits as its factorization.

30981502649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 47.

The spelling of 30981502649 in words is "thirty billion, nine hundred eighty-one million, five hundred two thousand, six hundred forty-nine".