9965731 has 2 divisors, whose sum is σ = 9965732. Its totient is φ = 9965730.

The previous prime is 9965729. The next prime is 9965737. The reversal of 9965731 is 1375699.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9965731 - 2¹ = 9965729 is a prime.

It is a super-2 number, since 2×9965731² = 198631588728722, which contains 22 as substring.

Together with 9965729, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9965737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4982865 + 4982866.

It is an arithmetic number, because the mean of its divisors is an integer number (4982866).

Almost surely, 2^9965731 is an apocalyptic number.

9965731 is a deficient number, since it is larger than the sum of its proper divisors (1).

9965731 is an equidigital number, since it uses as much as digits as its factorization.

9965731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51030, while the sum is 40.

The square root of 9965731 is about 3156.8546054578. The cubic root of 9965731 is about 215.1970862709.

The spelling of 9965731 in words is "nine million, nine hundred sixty-five thousand, seven hundred thirty-one".