30981506651 has 2 divisors, whose sum is σ = 30981506652. Its totient is φ = 30981506650.

The previous prime is 30981506641. The next prime is 30981506653. The reversal of 30981506651 is 15660518903.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 30981506651 - 2¹⁰ = 30981505627 is a prime.

It is a Sophie Germain prime.

Together with 30981506653, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (30981506653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15490753325 + 15490753326.

It is an arithmetic number, because the mean of its divisors is an integer number (15490753326).

Almost surely, 2^30981506651 is an apocalyptic number.

30981506651 is a deficient number, since it is larger than the sum of its proper divisors (1).

30981506651 is an equidigital number, since it uses as much as digits as its factorization.

30981506651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 194400, while the sum is 44.

The spelling of 30981506651 in words is "thirty billion, nine hundred eighty-one million, five hundred six thousand, six hundred fifty-one".