9845689949 has 2 divisors, whose sum is σ = 9845689950. Its totient is φ = 9845689948.

The previous prime is 9845689901. The next prime is 9845689951. The reversal of 9845689949 is 9499865489.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6711705625 + 3133984324 = 81925^2 + 55982^2 .

It is a cyclic number.

It is not a de Polignac number, because 9845689949 - 2¹⁶ = 9845624413 is a prime.

It is a super-2 number, since 2×9845689949² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 9845689951, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9845688949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4922844974 + 4922844975.

It is an arithmetic number, because the mean of its divisors is an integer number (4922844975).

Almost surely, 2^9845689949 is an apocalyptic number.

It is an amenable number.

9845689949 is a deficient number, since it is larger than the sum of its proper divisors (1).

9845689949 is an equidigital number, since it uses as much as digits as its factorization.

9845689949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 201553920, while the sum is 71.

The square root of 9845689949 is about 99225.4501073187. The cubic root of 9845689949 is about 2143.2954981536.

The spelling of 9845689949 in words is "nine billion, eight hundred forty-five million, six hundred eighty-nine thousand, nine hundred forty-nine".