9945919 has 2 divisors, whose sum is σ = 9945920. Its totient is φ = 9945918.

The previous prime is 9945889. The next prime is 9945937. The reversal of 9945919 is 9195499.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9945919 - 2¹⁹ = 9421631 is a prime.

It is a super-2 number, since 2×9945919² = 197842609509122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9945979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4972959 + 4972960.

It is an arithmetic number, because the mean of its divisors is an integer number (4972960).

Almost surely, 2^9945919 is an apocalyptic number.

9945919 is a deficient number, since it is larger than the sum of its proper divisors (1).

9945919 is an equidigital number, since it uses as much as digits as its factorization.

9945919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 131220, while the sum is 46.

The square root of 9945919 is about 3153.7151107860. The cubic root of 9945919 is about 215.0543868179.

The spelling of 9945919 in words is "nine million, nine hundred forty-five thousand, nine hundred nineteen".