30312331993 has 2 divisors, whose sum is σ = 30312331994. Its totient is φ = 30312331992.

The previous prime is 30312331949. The next prime is 30312332047. The reversal of 30312331993 is 39913321303.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22539617424 + 7772714569 = 150132^2 + 88163^2 .

It is a cyclic number.

It is not a de Polignac number, because 30312331993 - 2¹⁷ = 30312200921 is a prime.

It is not a weakly prime, because it can be changed into another prime (30312331913) 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, 15156165996 + 15156165997.

It is an arithmetic number, because the mean of its divisors is an integer number (15156165997).

Almost surely, 2^30312331993 is an apocalyptic number.

It is an amenable number.

30312331993 is a deficient number, since it is larger than the sum of its proper divisors (1).

30312331993 is an equidigital number, since it uses as much as digits as its factorization.

30312331993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39366, while the sum is 37.

The spelling of 30312331993 in words is "thirty billion, three hundred twelve million, three hundred thirty-one thousand, nine hundred ninety-three".