9925771897 has 2 divisors, whose sum is σ = 9925771898. Its totient is φ = 9925771896.

The previous prime is 9925771841. The next prime is 9925771907. The reversal of 9925771897 is 7981775299.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5691797136 + 4233974761 = 75444^2 + 65069^2 .

It is a cyclic number.

It is not a de Polignac number, because 9925771897 - 2¹⁹ = 9925247609 is a prime.

It is not a weakly prime, because it can be changed into another prime (9925771837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4962885948 + 4962885949.

It is an arithmetic number, because the mean of its divisors is an integer number (4962885949).

Almost surely, 2^9925771897 is an apocalyptic number.

It is an amenable number.

9925771897 is a deficient number, since it is larger than the sum of its proper divisors (1).

9925771897 is an equidigital number, since it uses as much as digits as its factorization.

9925771897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20003760, while the sum is 64.

The square root of 9925771897 is about 99628.1681905273. The cubic root of 9925771897 is about 2149.0907925586.

The spelling of 9925771897 in words is "nine billion, nine hundred twenty-five million, seven hundred seventy-one thousand, eight hundred ninety-seven".