9945997 has 2 divisors, whose sum is σ = 9945998. Its totient is φ = 9945996.

The previous prime is 9945983. The next prime is 9946039. The reversal of 9945997 is 7995499.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9696996 + 249001 = 3114^2 + 499^2 .

It is a cyclic number.

It is not a de Polignac number, because 9945997 - 2¹¹ = 9943949 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9945937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4972998 + 4972999.

It is an arithmetic number, because the mean of its divisors is an integer number (4972999).

Almost surely, 2^9945997 is an apocalyptic number.

It is an amenable number.

9945997 is a deficient number, since it is larger than the sum of its proper divisors (1).

9945997 is an equidigital number, since it uses as much as digits as its factorization.

9945997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 918540, while the sum is 52.

The square root of 9945997 is about 3153.7274771292. The cubic root of 9945997 is about 215.0549489982.

The spelling of 9945997 in words is "nine million, nine hundred forty-five thousand, nine hundred ninety-seven".