9931897 has 2 divisors, whose sum is σ = 9931898. Its totient is φ = 9931896.

The previous prime is 9931861. The next prime is 9931903. The reversal of 9931897 is 7981399.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8404201 + 1527696 = 2899^2 + 1236^2 .

It is a cyclic number.

It is not a de Polignac number, because 9931897 - 2⁷ = 9931769 is a prime.

9931897 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9931807) 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, 4965948 + 4965949.

It is an arithmetic number, because the mean of its divisors is an integer number (4965949).

Almost surely, 2^9931897 is an apocalyptic number.

It is an amenable number.

9931897 is a deficient number, since it is larger than the sum of its proper divisors (1).

9931897 is an equidigital number, since it uses as much as digits as its factorization.

9931897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 46.

The square root of 9931897 is about 3151.4912343207. The cubic root of 9931897 is about 214.9532763079.

The spelling of 9931897 in words is "nine million, nine hundred thirty-one thousand, eight hundred ninety-seven".