9925891 has 2 divisors, whose sum is σ = 9925892. Its totient is φ = 9925890.

The previous prime is 9925889. The next prime is 9925907. The reversal of 9925891 is 1985299.

9925891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9925891 - 2¹ = 9925889 is a prime.

Together with 9925889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (9923891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4962945 + 4962946.

It is an arithmetic number, because the mean of its divisors is an integer number (4962946).

Almost surely, 2^9925891 is an apocalyptic number.

9925891 is a deficient number, since it is larger than the sum of its proper divisors (1).

9925891 is an equidigital number, since it uses as much as digits as its factorization.

9925891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 43.

The square root of 9925891 is about 3150.5382079892. The cubic root of 9925891 is about 214.9099388435.

It can be divided in two parts, 9925 and 891, that added together give a square (10816 = 104²).

The spelling of 9925891 in words is "nine million, nine hundred twenty-five thousand, eight hundred ninety-one".