9897919 has 2 divisors, whose sum is σ = 9897920. Its totient is φ = 9897918.

The previous prime is 9897913. The next prime is 9897929. The reversal of 9897919 is 9197989.

It is a weak prime.

It is an emirp because it is prime and its reverse (9197989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9897919 - 2⁵ = 9897887 is a prime.

It is a super-2 number, since 2×9897919² = 195937601061122, which contains 22 as substring.

9897919 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9897913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4948959 + 4948960.

It is an arithmetic number, because the mean of its divisors is an integer number (4948960).

Almost surely, 2^9897919 is an apocalyptic number.

9897919 is a deficient number, since it is larger than the sum of its proper divisors (1).

9897919 is an equidigital number, since it uses as much as digits as its factorization.

9897919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 367416, while the sum is 52.

The square root of 9897919 is about 3146.0958345225. The cubic root of 9897919 is about 214.7078707840.

It can be divided in two parts, 9897 and 919, that added together give a square (10816 = 104²).

The spelling of 9897919 in words is "nine million, eight hundred ninety-seven thousand, nine hundred nineteen".