9985901 has 2 divisors, whose sum is σ = 9985902. Its totient is φ = 9985900.

The previous prime is 9985891. The next prime is 9985903. The reversal of 9985901 is 1095899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9424900 + 561001 = 3070^2 + 749^2 .

It is a cyclic number.

It is not a de Polignac number, because 9985901 - 2¹⁴ = 9969517 is a prime.

Together with 9985903, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9985903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4992950 + 4992951.

It is an arithmetic number, because the mean of its divisors is an integer number (4992951).

Almost surely, 2^9985901 is an apocalyptic number.

It is an amenable number.

9985901 is a deficient number, since it is larger than the sum of its proper divisors (1).

9985901 is an equidigital number, since it uses as much as digits as its factorization.

9985901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 41.

The square root of 9985901 is about 3160.0476262234. The cubic root of 9985901 is about 215.3421701322.

The spelling of 9985901 in words is "nine million, nine hundred eighty-five thousand, nine hundred one".