9933981949 has 2 divisors, whose sum is σ = 9933981950. Its totient is φ = 9933981948.

The previous prime is 9933981859. The next prime is 9933981973. The reversal of 9933981949 is 9491893399.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7052976324 + 2881005625 = 83982^2 + 53675^2 .

It is an emirp because it is prime and its reverse (9491893399) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9933981949 - 2²⁵ = 9900427517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9933981049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4966990974 + 4966990975.

It is an arithmetic number, because the mean of its divisors is an integer number (4966990975).

Almost surely, 2^9933981949 is an apocalyptic number.

It is an amenable number.

9933981949 is a deficient number, since it is larger than the sum of its proper divisors (1).

9933981949 is an equidigital number, since it uses as much as digits as its factorization.

9933981949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17006112, while the sum is 64.

The square root of 9933981949 is about 99669.3631413385. The cubic root of 9933981949 is about 2149.6831657873.

The spelling of 9933981949 in words is "nine billion, nine hundred thirty-three million, nine hundred eighty-one thousand, nine hundred forty-nine".