9890967509 has 2 divisors, whose sum is σ = 9890967510. Its totient is φ = 9890967508.

The previous prime is 9890967479. The next prime is 9890967511. The reversal of 9890967509 is 9057690989.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4987466884 + 4903500625 = 70622^2 + 70025^2 .

It is an emirp because it is prime and its reverse (9057690989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9890967509 - 2⁸ = 9890967253 is a prime.

Together with 9890967511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9890967599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4945483754 + 4945483755.

It is an arithmetic number, because the mean of its divisors is an integer number (4945483755).

Almost surely, 2^9890967509 is an apocalyptic number.

It is an amenable number.

9890967509 is a deficient number, since it is larger than the sum of its proper divisors (1).

9890967509 is an equidigital number, since it uses as much as digits as its factorization.

9890967509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11022480, while the sum is 62.

The square root of 9890967509 is about 99453.3433776864. The cubic root of 9890967509 is about 2146.5759458010.

The spelling of 9890967509 in words is "nine billion, eight hundred ninety million, nine hundred sixty-seven thousand, five hundred nine".