911983993 has 2 divisors, whose sum is σ = 911983994. Its totient is φ = 911983992.

The previous prime is 911983991. The next prime is 911983999. The reversal of 911983993 is 399389119.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 653160249 + 258823744 = 25557^2 + 16088^2 .

It is an emirp because it is prime and its reverse (399389119) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 911983993 - 2¹ = 911983991 is a prime.

Together with 911983991, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 911983993.

It is not a weakly prime, because it can be changed into another prime (911983991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 455991996 + 455991997.

It is an arithmetic number, because the mean of its divisors is an integer number (455991997).

Almost surely, 2^911983993 is an apocalyptic number.

It is an amenable number.

911983993 is a deficient number, since it is larger than the sum of its proper divisors (1).

911983993 is an equidigital number, since it uses as much as digits as its factorization.

911983993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 472392, while the sum is 52.

The square root of 911983993 is about 30199.0727175521. The cubic root of 911983993 is about 969.7558435337.

The spelling of 911983993 in words is "nine hundred eleven million, nine hundred eighty-three thousand, nine hundred ninety-three".