30518845991 has 2 divisors, whose sum is σ = 30518845992. Its totient is φ = 30518845990.

The previous prime is 30518845957. The next prime is 30518845997. The reversal of 30518845991 is 19954881503.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30518845991 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30518845997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15259422995 + 15259422996.

It is an arithmetic number, because the mean of its divisors is an integer number (15259422996).

Almost surely, 2^30518845991 is an apocalyptic number.

30518845991 is a deficient number, since it is larger than the sum of its proper divisors (1).

30518845991 is an equidigital number, since it uses as much as digits as its factorization.

30518845991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1555200, while the sum is 53.

The spelling of 30518845991 in words is "thirty billion, five hundred eighteen million, eight hundred forty-five thousand, nine hundred ninety-one".